70005281 has 4 divisors (see below), whose sum is σ = 70055700. Its totient is φ = 69954864.

The previous prime is 70005259. The next prime is 70005283. The reversal of 70005281 is 18250007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18250007 = 317 ⋅57571.

It can be written as a sum of positive squares in 2 ways, for example, as 1380625 + 68624656 = 1175^2 + 8284^2 .

It is a cyclic number.

It is not a de Polignac number, because 70005281 - 2¹⁸ = 69743137 is a prime.

It is a super-2 number, since 2×70005281² = 9801478735777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70005283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23066 + ... + 25923.

It is an arithmetic number, because the mean of its divisors is an integer number (17513925).

Almost surely, 2^70005281 is an apocalyptic number.

It is an amenable number.

70005281 is a deficient number, since it is larger than the sum of its proper divisors (50419).

70005281 is a wasteful number, since it uses less digits than its factorization.

70005281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50418.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 70005281 is about 8366.9158595028. The cubic root of 70005281 is about 412.1388937715.

Adding to 70005281 its reverse (18250007), we get a palindrome (88255288).

The spelling of 70005281 in words is "seventy million, five thousand, two hundred eighty-one".