72403712865 has 64 divisors (see below), whose sum is σ = 140927051520. Its totient is φ = 34977899520.

The previous prime is 72403712833. The next prime is 72403712873. The reversal of 72403712865 is 56821730427.

It is not a de Polignac number, because 72403712865 - 2⁵ = 72403712833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 72403712865.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 323337 + ... + 499353.

It is an arithmetic number, because the mean of its divisors is an integer number (2201985180).

Almost surely, 2^72403712865 is an apocalyptic number.

It is an amenable number.

72403712865 is a deficient number, since it is larger than the sum of its proper divisors (68523338655).

72403712865 is a wasteful number, since it uses less digits than its factorization.

72403712865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176319 (or 176313 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 72403712865 in words is "seventy-two billion, four hundred three million, seven hundred twelve thousand, eight hundred sixty-five".