78426864 has 30 divisors (see below), whose sum is σ = 219486696. Its totient is φ = 26142240.

The previous prime is 78426857. The next prime is 78426919. The reversal of 78426864 is 46862487.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272172 + ... + 272459.

Almost surely, 2^78426864 is an apocalyptic number.

It is an amenable number.

78426864 is an abundant number, since it is smaller than the sum of its proper divisors (141059832).

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

78426864 is a wasteful number, since it uses less digits than its factorization.

78426864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544645 (or 544636 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 78426864 is about 8855.8943083124. The cubic root of 78426864 is about 428.0438712417.

It can be divided in two parts, 7842 and 6864, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 78426864 in words is "seventy-eight million, four hundred twenty-six thousand, eight hundred sixty-four".