78752779625 has 32 divisors (see below), whose sum is σ = 107637828480. Its totient is φ = 57170136000.

The previous prime is 78752779621. The next prime is 78752779643. The reversal of 78752779625 is 52697725787.

It is not a de Polignac number, because 78752779625 - 2² = 78752779621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78752779621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314831 + ... + 506580.

It is an arithmetic number, because the mean of its divisors is an integer number (3363682140).

Almost surely, 2^78752779625 is an apocalyptic number.

It is an amenable number.

78752779625 is a deficient number, since it is larger than the sum of its proper divisors (28885048855).

78752779625 is a wasteful number, since it uses less digits than its factorization.

78752779625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821498 (or 821488 counting only the distinct ones).

The product of its digits is 103723200, while the sum is 65.

The spelling of 78752779625 in words is "seventy-eight billion, seven hundred fifty-two million, seven hundred seventy-nine thousand, six hundred twenty-five".