78057872 has 10 divisors (see below), whose sum is σ = 151237158. Its totient is φ = 39028928.

The previous prime is 78057853. The next prime is 78057877. The reversal of 78057872 is 27875087.

It can be written as a sum of positive squares in only one way, i.e., 75759616 + 2298256 = 8704^2 + 1516^2 .

It is not an unprimeable number, because it can be changed into a prime (78057877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2439293 + ... + 2439324.

Almost surely, 2^78057872 is an apocalyptic number.

It is an amenable number.

78057872 is a deficient number, since it is larger than the sum of its proper divisors (73179286).

78057872 is a wasteful number, since it uses less digits than its factorization.

78057872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4878625 (or 4878619 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 78057872 is about 8835.0366156570. The cubic root of 78057872 is about 427.3715118344.

The spelling of 78057872 in words is "seventy-eight million, fifty-seven thousand, eight hundred seventy-two".