78141289 has 4 divisors (see below), whose sum is σ = 78468480. Its totient is φ = 77814100.

The previous prime is 78141269. The next prime is 78141313. The reversal of 78141289 is 98214187.

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: 98214187 = 1163 ⋅84449.

It is a cyclic number.

It is not a de Polignac number, because 78141289 - 2¹⁵ = 78108521 is a prime.

It is a super-2 number, since 2×78141289² = 12212122093163042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78141209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163237 + ... + 163714.

It is an arithmetic number, because the mean of its divisors is an integer number (19617120).

Almost surely, 2^78141289 is an apocalyptic number.

It is an amenable number.

78141289 is a deficient number, since it is larger than the sum of its proper divisors (327191).

78141289 is a wasteful number, since it uses less digits than its factorization.

78141289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327190.

The product of its digits is 32256, while the sum is 40.

The square root of 78141289 is about 8839.7561617954. The cubic root of 78141289 is about 427.5236953226.

The spelling of 78141289 in words is "seventy-eight million, one hundred forty-one thousand, two hundred eighty-nine".