72999999 has 24 divisors (see below), whose sum is σ = 111601152. Its totient is φ = 45885840.

The previous prime is 72999991. The next prime is 73000003. The reversal of 72999999 is 99999927.

It is not a de Polignac number, because 72999999 - 2³ = 72999991 is a prime.

72999999 is a modest number, since divided by 9999 gives 7299 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72999991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12214 + ... + 17180.

It is an arithmetic number, because the mean of its divisors is an integer number (4650048).

Almost surely, 2^72999999 is an apocalyptic number.

72999999 is a deficient number, since it is larger than the sum of its proper divisors (38601153).

72999999 is a wasteful number, since it uses less digits than its factorization.

72999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067 (or 5064 counting only the distinct ones).

The product of its digits is 7440174, while the sum is 63.

The square root of 72999999 is about 8544.0036867970. The cubic root of 72999999 is about 417.9339177297.

Subtracting from 72999999 its sum of digits (63), we obtain a square (72999936 = 8544²).

The spelling of 72999999 in words is "seventy-two million, nine hundred ninety-nine thousand, nine hundred ninety-nine".