78392772 has 36 divisors (see below), whose sum is σ = 205501296. Its totient is φ = 26130600.

The previous prime is 78392761. The next prime is 78392773. The reversal of 78392772 is 27729387.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×78392772² = 12290853403687968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78392773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39354 + ... + 41297.

Almost surely, 2^78392772 is an apocalyptic number.

It is an amenable number.

78392772 is an abundant number, since it is smaller than the sum of its proper divisors (127108524).

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

78392772 is a wasteful number, since it uses less digits than its factorization.

78392772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80670 (or 80656 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 78392772 is about 8853.9692793684. The cubic root of 78392772 is about 427.9818389825.

The spelling of 78392772 in words is "seventy-eight million, three hundred ninety-two thousand, seven hundred seventy-two".