78402924 has 24 divisors (see below), whose sum is σ = 203267120. Its totient is φ = 26134272.

The previous prime is 78402901. The next prime is 78402941. The reversal of 78402924 is 42920487.

It is a super-2 number, since 2×78402924² = 12294036983499552, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 7 ways as a sum of consecutive naturals, for example, 362869 + ... + 363084.

Almost surely, 2^78402924 is an apocalyptic number.

It is an amenable number.

78402924 is an abundant number, since it is smaller than the sum of its proper divisors (124864196).

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

78402924 is a wasteful number, since it uses less digits than its factorization.

78402924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725966 (or 725958 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 78402924 is about 8854.5425630012. The cubic root of 78402924 is about 428.0003129820. Note that the first 3 decimals are identical.

The spelling of 78402924 in words is "seventy-eight million, four hundred two thousand, nine hundred twenty-four".