72400728155 has 16 divisors (see below), whose sum is σ = 99554430720. Its totient is φ = 49515211872.

The previous prime is 72400728151. The next prime is 72400728203. The reversal of 72400728155 is 55182700427.

It is not a de Polignac number, because 72400728155 - 2² = 72400728151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72400728151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2715749 + ... + 2742278.

It is an arithmetic number, because the mean of its divisors is an integer number (6222151920).

Almost surely, 2^72400728155 is an apocalyptic number.

72400728155 is a deficient number, since it is larger than the sum of its proper divisors (27153702565).

72400728155 is a wasteful number, since it uses less digits than its factorization.

72400728155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5458418.

The product of its (nonzero) digits is 156800, while the sum is 41.

The spelling of 72400728155 in words is "seventy-two billion, four hundred million, seven hundred twenty-eight thousand, one hundred fifty-five".