72724730 has 16 divisors (see below), whose sum is σ = 140974344. Its totient is φ = 26852160.

The previous prime is 72724727. The next prime is 72724733. The reversal of 72724730 is 3742727.

It is an interprime number because it is at equal distance from previous prime (72724727) and next prime (72724733).

It can be written as a sum of positive squares in 4 ways, for example, as 38700841 + 34023889 = 6221^2 + 5833^2 .

It is not an unprimeable number, because it can be changed into a prime (72724733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279581 + ... + 279840.

Almost surely, 2^72724730 is an apocalyptic number.

72724730 is a deficient number, since it is larger than the sum of its proper divisors (68249614).

72724730 is a wasteful number, since it uses less digits than its factorization.

72724730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559441.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 72724730 is about 8527.8795723204. The cubic root of 72724730 is about 417.4079398296.

The spelling of 72724730 in words is "seventy-two million, seven hundred twenty-four thousand, seven hundred thirty".