72304657 has 2 divisors, whose sum is σ = 72304658. Its totient is φ = 72304656.

The previous prime is 72304651. The next prime is 72304693. The reversal of 72304657 is 75640327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48108096 + 24196561 = 6936^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 72304657 - 2¹¹ = 72302609 is a prime.

It is not a weakly prime, because it can be changed into another prime (72304651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36152328 + 36152329.

It is an arithmetic number, because the mean of its divisors is an integer number (36152329).

Almost surely, 2^72304657 is an apocalyptic number.

It is an amenable number.

72304657 is a deficient number, since it is larger than the sum of its proper divisors (1).

72304657 is an equidigital number, since it uses as much as digits as its factorization.

72304657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 72304657 is about 8503.2145098192. The cubic root of 72304657 is about 416.6027094010.

The spelling of 72304657 in words is "seventy-two million, three hundred four thousand, six hundred fifty-seven".