72837731 has 2 divisors, whose sum is σ = 72837732. Its totient is φ = 72837730.

The previous prime is 72837727. The next prime is 72837767. The reversal of 72837731 is 13773827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72837731 - 2² = 72837727 is a prime.

It is a super-2 number, since 2×72837731² = 10610670114456722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72837031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36418865 + 36418866.

It is an arithmetic number, because the mean of its divisors is an integer number (36418866).

Almost surely, 2^72837731 is an apocalyptic number.

72837731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72837731 is an equidigital number, since it uses as much as digits as its factorization.

72837731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 72837731 is about 8534.5023873686. The cubic root of 72837731 is about 417.6240199523.

The spelling of 72837731 in words is "seventy-two million, eight hundred thirty-seven thousand, seven hundred thirty-one".