72227657 has 2 divisors, whose sum is σ = 72227658. Its totient is φ = 72227656.

The previous prime is 72227653. The next prime is 72227669. The reversal of 72227657 is 75672227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66520336 + 5707321 = 8156^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 72227657 - 2² = 72227653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72227657.

It is not a weakly prime, because it can be changed into another prime (72227653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36113828 + 36113829.

It is an arithmetic number, because the mean of its divisors is an integer number (36113829).

Almost surely, 2^72227657 is an apocalyptic number.

It is an amenable number.

72227657 is a deficient number, since it is larger than the sum of its proper divisors (1).

72227657 is an equidigital number, since it uses as much as digits as its factorization.

72227657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 38.

The square root of 72227657 is about 8498.6856042567. The cubic root of 72227657 is about 416.4547714771.

The spelling of 72227657 in words is "seventy-two million, two hundred twenty-seven thousand, six hundred fifty-seven".