72745073 has 2 divisors, whose sum is σ = 72745074. Its totient is φ = 72745072.

The previous prime is 72745061. The next prime is 72745103. The reversal of 72745073 is 37054727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72709729 + 35344 = 8527^2 + 188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72745073 is a prime.

It is not a weakly prime, because it can be changed into another prime (72745973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36372536 + 36372537.

It is an arithmetic number, because the mean of its divisors is an integer number (36372537).

Almost surely, 2^72745073 is an apocalyptic number.

It is an amenable number.

72745073 is a deficient number, since it is larger than the sum of its proper divisors (1).

72745073 is an equidigital number, since it uses as much as digits as its factorization.

72745073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 35.

The square root of 72745073 is about 8529.0722238705. The cubic root of 72745073 is about 417.4468561564.

The spelling of 72745073 in words is "seventy-two million, seven hundred forty-five thousand, seventy-three".