78857396 has 12 divisors (see below), whose sum is σ = 138066180. Its totient is φ = 39409920.

The previous prime is 78857381. The next prime is 78857413. The reversal of 78857396 is 69375887.

It can be written as a sum of positive squares in 2 ways, for example, as 30360100 + 48497296 = 5510^2 + 6964^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9566 + ... + 15786.

It is an arithmetic number, because the mean of its divisors is an integer number (11505515).

Almost surely, 2^78857396 is an apocalyptic number.

It is an amenable number.

78857396 is a deficient number, since it is larger than the sum of its proper divisors (59208784).

78857396 is a wasteful number, since it uses less digits than its factorization.

78857396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394 (or 9392 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 53.

The square root of 78857396 is about 8880.1686920914. The cubic root of 78857396 is about 428.8257053374.

The spelling of 78857396 in words is "seventy-eight million, eight hundred fifty-seven thousand, three hundred ninety-six".