78715746 has 64 divisors (see below), whose sum is σ = 195004800. Its totient is φ = 23390208.

The previous prime is 78715733. The next prime is 78715751. The reversal of 78715746 is 64751787.

78715746 is a `hidden beast` number, since 7 + 8 + 71 + 574 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15186 + ... + 19698.

It is an arithmetic number, because the mean of its divisors is an integer number (3046950).

Almost surely, 2^78715746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78715746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97502400).

78715746 is an abundant number, since it is smaller than the sum of its proper divisors (116289054).

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

78715746 is a wasteful number, since it uses less digits than its factorization.

78715746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560 (or 4554 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 78715746 is about 8872.1894704746. The cubic root of 78715746 is about 428.5687876980.

The spelling of 78715746 in words is "seventy-eight million, seven hundred fifteen thousand, seven hundred forty-six".