72724815 has 24 divisors (see below), whose sum is σ = 127943088. Its totient is φ = 38206080.

The previous prime is 72724811. The next prime is 72724823. The reversal of 72724815 is 51842727.

It is not a de Polignac number, because 72724815 - 2² = 72724811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72724815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72724811) 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, 9046 + ... + 15075.

It is an arithmetic number, because the mean of its divisors is an integer number (5330962).

Almost surely, 2^72724815 is an apocalyptic number.

72724815 is a deficient number, since it is larger than the sum of its proper divisors (55218273).

72724815 is a wasteful number, since it uses less digits than its factorization.

72724815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24199 (or 24196 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 72724815 is about 8527.8845559728. The cubic root of 72724815 is about 417.4081024504.

The spelling of 72724815 in words is "seventy-two million, seven hundred twenty-four thousand, eight hundred fifteen".