72500731 has 2 divisors, whose sum is σ = 72500732. Its totient is φ = 72500730.

The previous prime is 72500717. The next prime is 72500741. The reversal of 72500731 is 13700527.

It is a strong prime.

It is an emirp because it is prime and its reverse (13700527) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72500731 is a prime.

It is a super-2 number, since 2×72500731² = 10512711991068722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72500696 and 72500705.

It is not a weakly prime, because it can be changed into another prime (72500711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36250365 + 36250366.

It is an arithmetic number, because the mean of its divisors is an integer number (36250366).

Almost surely, 2^72500731 is an apocalyptic number.

72500731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72500731 is an equidigital number, since it uses as much as digits as its factorization.

72500731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 72500731 is about 8514.7361086530. The cubic root of 72500731 is about 416.9789471934.

The spelling of 72500731 in words is "seventy-two million, five hundred thousand, seven hundred thirty-one".