72499815 has 24 divisors (see below), whose sum is σ = 133059888. Its totient is φ = 36391680.

The previous prime is 72499807. The next prime is 72499831. The reversal of 72499815 is 51899427.

It is not a de Polignac number, because 72499815 - 2³ = 72499807 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46621 + ... + 48150.

It is an arithmetic number, because the mean of its divisors is an integer number (5544162).

Almost surely, 2^72499815 is an apocalyptic number.

72499815 is a deficient number, since it is larger than the sum of its proper divisors (60560073).

72499815 is a wasteful number, since it uses less digits than its factorization.

72499815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94799 (or 94796 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 72499815 is about 8514.6823193822. The cubic root of 72499815 is about 416.9771910993.

The spelling of 72499815 in words is "seventy-two million, four hundred ninety-nine thousand, eight hundred fifteen".