78728658650 has 24 divisors (see below), whose sum is σ = 151159027584. Its totient is φ = 30475609200.

The previous prime is 78728658649. The next prime is 78728658661. The reversal of 78728658650 is 5685682787.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25394792 + ... + 25397891.

It is an arithmetic number, because the mean of its divisors is an integer number (6298292816).

Almost surely, 2^78728658650 is an apocalyptic number.

78728658650 is a deficient number, since it is larger than the sum of its proper divisors (72430368934).

78728658650 is a wasteful number, since it uses less digits than its factorization.

78728658650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50792726 (or 50792721 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 78728658650 in words is "seventy-eight billion, seven hundred twenty-eight million, six hundred fifty-eight thousand, six hundred fifty".