72970717 has 2 divisors, whose sum is σ = 72970718. Its totient is φ = 72970716.

The previous prime is 72970679. The next prime is 72970741. The reversal of 72970717 is 71707927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 21288996 = 7189^2 + 4614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72970717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72970717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72980717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36485358 + 36485359.

It is an arithmetic number, because the mean of its divisors is an integer number (36485359).

Almost surely, 2^72970717 is an apocalyptic number.

It is an amenable number.

72970717 is a deficient number, since it is larger than the sum of its proper divisors (1).

72970717 is an equidigital number, since it uses as much as digits as its factorization.

72970717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43218, while the sum is 40.

The square root of 72970717 is about 8542.2899154735. The cubic root of 72970717 is about 417.8780292466.

The spelling of 72970717 in words is "seventy-two million, nine hundred seventy thousand, seven hundred seventeen".