72491815850 has 24 divisors (see below), whose sum is σ = 134929003500. Its totient is φ = 28976462720.

The previous prime is 72491815841. The next prime is 72491815919. The reversal of 72491815850 is 5851819427.

It can be written as a sum of positive squares in 6 ways, for example, as 41674364449 + 30817451401 = 204143^2 + 175549^2 .

It is a super-2 number, since 2×72491815850² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434225 + ... + 577524.

Almost surely, 2^72491815850 is an apocalyptic number.

72491815850 is a deficient number, since it is larger than the sum of its proper divisors (62437187650).

72491815850 is a wasteful number, since it uses less digits than its factorization.

72491815850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013194 (or 1013189 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 72491815850 in words is "seventy-two billion, four hundred ninety-one million, eight hundred fifteen thousand, eight hundred fifty".