78257213564 has 48 divisors (see below), whose sum is σ = 142614528000. Its totient is φ = 37533041280.

The previous prime is 78257213563. The next prime is 78257213611. The reversal of 78257213564 is 46531275287.

It is a super-2 number, since 2×78257213564² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78257213561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26092937 + ... + 26095935.

It is an arithmetic number, because the mean of its divisors is an integer number (2971136000).

Almost surely, 2^78257213564 is an apocalyptic number.

It is an amenable number.

78257213564 is a deficient number, since it is larger than the sum of its proper divisors (64357314436).

78257213564 is a wasteful number, since it uses less digits than its factorization.

78257213564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818 (or 4816 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 50.

The spelling of 78257213564 in words is "seventy-eight billion, two hundred fifty-seven million, two hundred thirteen thousand, five hundred sixty-four".