78757864 has 8 divisors (see below), whose sum is σ = 147671010. Its totient is φ = 39378928.

The previous prime is 78757859. The next prime is 78757879. The reversal of 78757864 is 46875787.

It can be written as a sum of positive squares in only one way, i.e., 55621764 + 23136100 = 7458^2 + 4810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78757864² = 12405602283684992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922359 + ... + 4922374.

Almost surely, 2^78757864 is an apocalyptic number.

It is an amenable number.

78757864 is a deficient number, since it is larger than the sum of its proper divisors (68913146).

78757864 is a wasteful number, since it uses less digits than its factorization.

78757864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9844739 (or 9844735 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The square root of 78757864 is about 8874.5627497922. The cubic root of 78757864 is about 428.6452113815.

The spelling of 78757864 in words is "seventy-eight million, seven hundred fifty-seven thousand, eight hundred sixty-four".