72621575817 has 32 divisors (see below), whose sum is σ = 119663972352. Its totient is φ = 38225973504.

The previous prime is 72621575809. The next prime is 72621575891. The reversal of 72621575817 is 71857512627.

It is not a de Polignac number, because 72621575817 - 2³ = 72621575809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 72621575817.

It is not an unprimeable number, because it can be changed into a prime (72621565817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147283 + ... + 2180840.

It is an arithmetic number, because the mean of its divisors is an integer number (3739499136).

Almost surely, 2^72621575817 is an apocalyptic number.

It is an amenable number.

72621575817 is a deficient number, since it is larger than the sum of its proper divisors (47042396535).

72621575817 is a wasteful number, since it uses less digits than its factorization.

72621575817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328197.

The product of its digits is 1646400, while the sum is 51.

The spelling of 72621575817 in words is "seventy-two billion, six hundred twenty-one million, five hundred seventy-five thousand, eight hundred seventeen".