72163457 has 2 divisors, whose sum is σ = 72163458. Its totient is φ = 72163456.

The previous prime is 72163451. The next prime is 72163529. The reversal of 72163457 is 75436127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60357361 + 11806096 = 7769^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 72163457 - 2⁶ = 72163393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72163451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36081728 + 36081729.

It is an arithmetic number, because the mean of its divisors is an integer number (36081729).

Almost surely, 2^72163457 is an apocalyptic number.

It is an amenable number.

72163457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72163457 is an equidigital number, since it uses as much as digits as its factorization.

72163457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 72163457 is about 8494.9077099166. The cubic root of 72163457 is about 416.3313454334.

The spelling of 72163457 in words is "seventy-two million, one hundred sixty-three thousand, four hundred fifty-seven".