72737231 has 8 divisors (see below), whose sum is σ = 83301504. Its totient is φ = 62216280.

The previous prime is 72737221. The next prime is 72737233. The reversal of 72737231 is 13273727.

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

It is not a de Polignac number, because 72737231 - 2¹⁸ = 72475087 is a prime.

It is a super-2 number, since 2×72737231² = 10581409547094722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72737233) 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, 7145 + ... + 14018.

It is an arithmetic number, because the mean of its divisors is an integer number (10412688).

Almost surely, 2^72737231 is an apocalyptic number.

72737231 is a deficient number, since it is larger than the sum of its proper divisors (10564273).

72737231 is a wasteful number, since it uses less digits than its factorization.

72737231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21661.

The product of its digits is 12348, while the sum is 32.

The square root of 72737231 is about 8528.6124897313. The cubic root of 72737231 is about 417.4318552052.

The spelling of 72737231 in words is "seventy-two million, seven hundred thirty-seven thousand, two hundred thirty-one".