72125637728 has 24 divisors (see below), whose sum is σ = 142042188960. Its totient is φ = 36051431040.

The previous prime is 72125637713. The next prime is 72125637761. The reversal of 72125637728 is 82773652127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252488 + ... + 456071.

It is an arithmetic number, because the mean of its divisors is an integer number (5918424540).

Almost surely, 2^72125637728 is an apocalyptic number.

It is an amenable number.

72125637728 is a deficient number, since it is larger than the sum of its proper divisors (69916551232).

72125637728 is a wasteful number, since it uses less digits than its factorization.

72125637728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711750 (or 711742 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 50.

The spelling of 72125637728 in words is "seventy-two billion, one hundred twenty-five million, six hundred thirty-seven thousand, seven hundred twenty-eight".