72731861 has 8 divisors (see below), whose sum is σ = 73786944. Its totient is φ = 71683200.

The previous prime is 72731851. The next prime is 72731863. The reversal of 72731861 is 16813727.

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 72731861 - 2¹⁰ = 72730837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72731863) 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, 24086 + ... + 26936.

It is an arithmetic number, because the mean of its divisors is an integer number (9223368).

Almost surely, 2^72731861 is an apocalyptic number.

It is an amenable number.

72731861 is a deficient number, since it is larger than the sum of its proper divisors (1055083).

72731861 is a wasteful number, since it uses less digits than its factorization.

72731861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211.

The product of its digits is 14112, while the sum is 35.

The square root of 72731861 is about 8528.2976613155. The cubic root of 72731861 is about 417.4215823174.

The spelling of 72731861 in words is "seventy-two million, seven hundred thirty-one thousand, eight hundred sixty-one".