78973664 has 48 divisors (see below), whose sum is σ = 193850496. Its totient is φ = 30768000.

The previous prime is 78973639. The next prime is 78973681. The reversal of 78973664 is 46637987.

It is a super-4 number, since 4×78973664⁴ (a number of 33 digits) contains 4444 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13562 + ... + 18489.

It is an arithmetic number, because the mean of its divisors is an integer number (4038552).

Almost surely, 2^78973664 is an apocalyptic number.

It is an amenable number.

78973664 is an abundant number, since it is smaller than the sum of its proper divisors (114876832).

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

78973664 is a wasteful number, since it uses less digits than its factorization.

78973664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32079 (or 32071 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 50.

The square root of 78973664 is about 8886.7127780749. The cubic root of 78973664 is about 429.0363565705.

The spelling of 78973664 in words is "seventy-eight million, nine hundred seventy-three thousand, six hundred sixty-four".