72310657 has 2 divisors, whose sum is σ = 72310658. Its totient is φ = 72310656.

The previous prime is 72310633. The next prime is 72310663. The reversal of 72310657 is 75601327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66080641 + 6230016 = 8129^2 + 2496^2 .

It is a cyclic number.

It is not a de Polignac number, because 72310657 - 2¹¹ = 72308609 is a prime.

It is a super-2 number, since 2×72310657² = 10457662231543298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72310607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36155328 + 36155329.

It is an arithmetic number, because the mean of its divisors is an integer number (36155329).

Almost surely, 2^72310657 is an apocalyptic number.

It is an amenable number.

72310657 is a deficient number, since it is larger than the sum of its proper divisors (1).

72310657 is an equidigital number, since it uses as much as digits as its factorization.

72310657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 72310657 is about 8503.5673102528. The cubic root of 72310657 is about 416.6142326197.

The spelling of 72310657 in words is "seventy-two million, three hundred ten thousand, six hundred fifty-seven".