78642868 has 12 divisors (see below), whose sum is σ = 138339460. Its totient is φ = 39117312.

The previous prime is 78642853. The next prime is 78642923. The reversal of 78642868 is 86824687.

It can be written as a sum of positive squares in 2 ways, for example, as 18766224 + 59876644 = 4332^2 + 7738^2 .

It is a congruent number.

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, 50163 + ... + 51706.

Almost surely, 2^78642868 is an apocalyptic number.

It is an amenable number.

78642868 is a deficient number, since it is larger than the sum of its proper divisors (59696592).

78642868 is a wasteful number, since it uses less digits than its factorization.

78642868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102066 (or 102064 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 78642868 is about 8868.0814159546. The cubic root of 78642868 is about 428.4364851553.

The spelling of 78642868 in words is "seventy-eight million, six hundred forty-two thousand, eight hundred sixty-eight".