78279964 has 12 divisors (see below), whose sum is σ = 156559984. Its totient is φ = 33548544.

The previous prime is 78279953. The next prime is 78279977. The reversal of 78279964 is 46997287.

78279964 is an admirable number.

It is a super-2 number, since 2×78279964² = 12255505527682592, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1397829 + ... + 1397884.

Almost surely, 2^78279964 is an apocalyptic number.

It is an amenable number.

78279964 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78279964 is a wasteful number, since it uses less digits than its factorization.

78279964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795724 (or 2795722 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The square root of 78279964 is about 8847.5965097873. The cubic root of 78279964 is about 427.7764503523.

The spelling of 78279964 in words is "seventy-eight million, two hundred seventy-nine thousand, nine hundred sixty-four".