78817264 has 10 divisors (see below), whose sum is σ = 152708480. Its totient is φ = 39408624.

The previous prime is 78817247. The next prime is 78817267. The reversal of 78817264 is 46271887.

It is a super-2 number, since 2×78817264² = 12424322208891392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78817264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78817267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2463024 + ... + 2463055.

It is an arithmetic number, because the mean of its divisors is an integer number (15270848).

Almost surely, 2^78817264 is an apocalyptic number.

It is an amenable number.

78817264 is a deficient number, since it is larger than the sum of its proper divisors (73891216).

78817264 is a wasteful number, since it uses less digits than its factorization.

78817264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926087 (or 4926081 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 78817264 is about 8877.9087627662. The cubic root of 78817264 is about 428.7529471928.

The spelling of 78817264 in words is "seventy-eight million, eight hundred seventeen thousand, two hundred sixty-four".