78404625 has 64 divisors (see below), whose sum is σ = 156199680. Its totient is φ = 38577600.

The previous prime is 78404567. The next prime is 78404633. The reversal of 78404625 is 52640487.

It is not a de Polignac number, because 78404625 - 2⁹ = 78404113 is a prime.

It is a super-2 number, since 2×78404625² = 12294570442781250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78404625.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 42982 + ... + 44768.

It is an arithmetic number, because the mean of its divisors is an integer number (2440620).

Almost surely, 2^78404625 is an apocalyptic number.

78404625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78404625 is a deficient number, since it is larger than the sum of its proper divisors (77795055).

78404625 is a wasteful number, since it uses less digits than its factorization.

78404625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1808 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 78404625 is about 8854.6386148730. The cubic root of 78404625 is about 428.0034082036.

The spelling of 78404625 in words is "seventy-eight million, four hundred four thousand, six hundred twenty-five".