78921568 has 24 divisors (see below), whose sum is σ = 169502760. Its totient is φ = 35873280.

The previous prime is 78921539. The next prime is 78921581. The reversal of 78921568 is 86512987.

It is a super-2 number, since 2×78921568² = 12457227791157248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 111753 + ... + 112456.

It is an arithmetic number, because the mean of its divisors is an integer number (7062615).

Almost surely, 2^78921568 is an apocalyptic number.

It is an amenable number.

78921568 is an abundant number, since it is smaller than the sum of its proper divisors (90581192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78921568 is a wasteful number, since it uses less digits than its factorization.

78921568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224230 (or 224222 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 78921568 is about 8883.7811769539. The cubic root of 78921568 is about 428.9419960229.

The spelling of 78921568 in words is "seventy-eight million, nine hundred twenty-one thousand, five hundred sixty-eight".