73712557 has 2 divisors, whose sum is σ = 73712558. Its totient is φ = 73712556.

The previous prime is 73712543. The next prime is 73712567. The reversal of 73712557 is 75521737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72948681 + 763876 = 8541^2 + 874^2 .

It is an emirp because it is prime and its reverse (75521737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73712557 - 2¹⁵ = 73679789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73712537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36856278 + 36856279.

It is an arithmetic number, because the mean of its divisors is an integer number (36856279).

Almost surely, 2^73712557 is an apocalyptic number.

It is an amenable number.

73712557 is a deficient number, since it is larger than the sum of its proper divisors (1).

73712557 is an equidigital number, since it uses as much as digits as its factorization.

73712557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51450, while the sum is 37.

The square root of 73712557 is about 8585.6017261459. The cubic root of 73712557 is about 419.2893443296.

The spelling of 73712557 in words is "seventy-three million, seven hundred twelve thousand, five hundred fifty-seven".