78758864 has 20 divisors (see below), whose sum is σ = 155183520. Its totient is φ = 38711520.

The previous prime is 78758863. The next prime is 78758921. The reversal of 78758864 is 46885787.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78758863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40772 + ... + 42659.

It is an arithmetic number, because the mean of its divisors is an integer number (7759176).

Almost surely, 2^78758864 is an apocalyptic number.

It is an amenable number.

78758864 is a deficient number, since it is larger than the sum of its proper divisors (76424656).

78758864 is a wasteful number, since it uses less digits than its factorization.

78758864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83498 (or 83492 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 53.

The square root of 78758864 is about 8874.6190904173. The cubic root of 78758864 is about 428.6470255639.

The spelling of 78758864 in words is "seventy-eight million, seven hundred fifty-eight thousand, eight hundred sixty-four".