78118578 has 24 divisors (see below), whose sum is σ = 169462800. Its totient is φ = 26007864.

The previous prime is 78118567. The next prime is 78118619. The reversal of 78118578 is 87581187.

78118578 is a `hidden beast` number, since 78 + 1 + 1 + 8 + 578 = 666.

It is a super-2 number, since 2×78118578² = 12205024457484168, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16213 + ... + 20471.

It is an arithmetic number, because the mean of its divisors is an integer number (7060950).

Almost surely, 2^78118578 is an apocalyptic number.

78118578 is an abundant number, since it is smaller than the sum of its proper divisors (91344222).

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

78118578 is a wasteful number, since it uses less digits than its factorization.

78118578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286 (or 5283 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 78118578 is about 8838.4714741860. The cubic root of 78118578 is about 427.4822727850.

The spelling of 78118578 in words is "seventy-eight million, one hundred eighteen thousand, five hundred seventy-eight".