72536731 has 4 divisors (see below), whose sum is σ = 72572200. Its totient is φ = 72501264.

The previous prime is 72536719. The next prime is 72536759. The reversal of 72536731 is 13763527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13763527 = 47 ⋅292841.

It is a cyclic number.

It is not a de Polignac number, because 72536731 - 2¹⁷ = 72405659 is a prime.

It is a super-2 number, since 2×72536731² = 10523154688332722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72536791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14466 + ... + 18823.

It is an arithmetic number, because the mean of its divisors is an integer number (18143050).

Almost surely, 2^72536731 is an apocalyptic number.

72536731 is a deficient number, since it is larger than the sum of its proper divisors (35469).

72536731 is a wasteful number, since it uses less digits than its factorization.

72536731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35468.

The product of its digits is 26460, while the sum is 34.

The square root of 72536731 is about 8516.8498284283. The cubic root of 72536731 is about 417.0479522824.

The spelling of 72536731 in words is "seventy-two million, five hundred thirty-six thousand, seven hundred thirty-one".