72742057 has 2 divisors, whose sum is σ = 72742058. Its totient is φ = 72742056.

The previous prime is 72742003. The next prime is 72742067. The reversal of 72742057 is 75024727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69956496 + 2785561 = 8364^2 + 1669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72742057 is a prime.

It is not a weakly prime, because it can be changed into another prime (72742067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36371028 + 36371029.

It is an arithmetic number, because the mean of its divisors is an integer number (36371029).

Almost surely, 2^72742057 is an apocalyptic number.

It is an amenable number.

72742057 is a deficient number, since it is larger than the sum of its proper divisors (1).

72742057 is an equidigital number, since it uses as much as digits as its factorization.

72742057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 72742057 is about 8528.8954149995. The cubic root of 72742057 is about 417.4410869817.

The spelling of 72742057 in words is "seventy-two million, seven hundred forty-two thousand, fifty-seven".