72830731 has 2 divisors, whose sum is σ = 72830732. Its totient is φ = 72830730.

The previous prime is 72830729. The next prime is 72830761. The reversal of 72830731 is 13703827.

It is a weak prime.

It is an emirp because it is prime and its reverse (13703827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72830731 - 2¹ = 72830729 is a prime.

It is a super-2 number, since 2×72830731² = 10608630755988722, which contains 22 as substring.

Together with 72830729, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72830693 and 72830702.

It is not a weakly prime, because it can be changed into another prime (72830701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36415365 + 36415366.

It is an arithmetic number, because the mean of its divisors is an integer number (36415366).

Almost surely, 2^72830731 is an apocalyptic number.

72830731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72830731 is an equidigital number, since it uses as much as digits as its factorization.

72830731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72830731 is about 8534.0922774481. The cubic root of 72830731 is about 417.6106410723.

The spelling of 72830731 in words is "seventy-two million, eight hundred thirty thousand, seven hundred thirty-one".