78400264 has 16 divisors (see below), whose sum is σ = 147095100. Its totient is φ = 39174912.

The previous prime is 78400247. The next prime is 78400337. The reversal of 78400264 is 46200487.

It can be written as a sum of positive squares in 2 ways, for example, as 64931364 + 13468900 = 8058^2 + 3670^2 .

It is a super-2 number, since 2×78400264² = 12293202790539392, which contains 22 as substring.

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, 20452 + ... + 23980.

Almost surely, 2^78400264 is an apocalyptic number.

It is an amenable number.

78400264 is a deficient number, since it is larger than the sum of its proper divisors (68694836).

78400264 is a wasteful number, since it uses less digits than its factorization.

78400264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312 (or 6308 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 78400264 is about 8854.3923563393. The cubic root of 78400264 is about 427.9954726280.

The spelling of 78400264 in words is "seventy-eight million, four hundred thousand, two hundred sixty-four".