78857388 has 42 divisors (see below), whose sum is σ = 206913644. Its totient is φ = 26284824.

The previous prime is 78857381. The next prime is 78857413. The reversal of 78857388 is 88375887.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78857381) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10606 + ... + 16437.

Almost surely, 2^78857388 is an apocalyptic number.

It is an amenable number.

78857388 is an abundant number, since it is smaller than the sum of its proper divisors (128056256).

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

78857388 is a wasteful number, since it uses less digits than its factorization.

78857388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27065 (or 27048 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 78857388 is about 8880.1682416495. The cubic root of 78857388 is about 428.8256908361.

The spelling of 78857388 in words is "seventy-eight million, eight hundred fifty-seven thousand, three hundred eighty-eight".