72157787408 has 40 divisors (see below), whose sum is σ = 160050297792. Its totient is φ = 30872055168.

The previous prime is 72157787389. The next prime is 72157787413. The reversal of 72157787408 is 80478775127.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483035 + ... + 614522.

Almost surely, 2^72157787408 is an apocalyptic number.

It is an amenable number.

72157787408 is an abundant number, since it is smaller than the sum of its proper divisors (87892510384).

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

72157787408 is a wasteful number, since it uses less digits than its factorization.

72157787408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098159 (or 1098153 counting only the distinct ones).

The product of its (nonzero) digits is 6146560, while the sum is 56.

The spelling of 72157787408 in words is "seventy-two billion, one hundred fifty-seven million, seven hundred eighty-seven thousand, four hundred eight".