| Base | Representation |
|---|---|
| bin | 1000010110010… |
| … | …00011000011101 |
| 3 | 11212202201200111 |
| 4 | 10023020120131 |
| 5 | 120411324111 |
| 6 | 10540530021 |
| 7 | 1510134466 |
| oct | 413103035 |
| 9 | 155681614 |
| 10 | 70026781 |
| 11 | 3658a180 |
| 12 | 1b550911 |
| 13 | 1167aa86 |
| 14 | 942bd6d |
| 15 | 6233a21 |
| hex | 42c861d |
70026781 has 4 divisors (see below), whose sum is σ = 76392864. Its totient is φ = 63660700.
The previous prime is 70026773. The next prime is 70026787. The reversal of 70026781 is 18762007.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18762007 = 11 ⋅1705637.
It is a cyclic number.
It is not a de Polignac number, because 70026781 - 23 = 70026773 is a prime.
It is a super-2 number, since 2×700267812 = 9807500114443922, which contains 22 as substring.
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (70026787) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3183025 + ... + 3183046.
It is an arithmetic number, because the mean of its divisors is an integer number (19098216).
Almost surely, 270026781 is an apocalyptic number.
It is an amenable number.
70026781 is a deficient number, since it is larger than the sum of its proper divisors (6366083).
70026781 is a wasteful number, since it uses less digits than its factorization.
70026781 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6366082.
The product of its (nonzero) digits is 4704, while the sum is 31.
The square root of 70026781 is about 8368.2005831600. The cubic root of 70026781 is about 412.1810814423.
Adding to 70026781 its reverse (18762007), we get a palindrome (88788788).
It can be divided in two parts, 70026 and 781, that added together give a palindrome (70807).
The spelling of 70026781 in words is "seventy million, twenty-six thousand, seven hundred eighty-one".
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