72739531 has 8 divisors (see below), whose sum is σ = 74636144. Its totient is φ = 70852320.

The previous prime is 72739529. The next prime is 72739553. The reversal of 72739531 is 13593727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72739531 - 2¹ = 72739529 is a prime.

It is a super-2 number, since 2×72739531² = 10582078740199922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72739561) 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, 14941 + ... + 19201.

It is an arithmetic number, because the mean of its divisors is an integer number (9329518).

Almost surely, 2^72739531 is an apocalyptic number.

72739531 is a deficient number, since it is larger than the sum of its proper divisors (1896613).

72739531 is a wasteful number, since it uses less digits than its factorization.

72739531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701.

The product of its digits is 39690, while the sum is 37.

The square root of 72739531 is about 8528.7473288872. The cubic root of 72739531 is about 417.4362549838.

The spelling of 72739531 in words is "seventy-two million, seven hundred thirty-nine thousand, five hundred thirty-one".