72907213 has 2 divisors, whose sum is σ = 72907214. Its totient is φ = 72907212.

The previous prime is 72907201. The next prime is 72907223. The reversal of 72907213 is 31270927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 32228329 = 6378^2 + 5677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72907213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72907223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36453606 + 36453607.

It is an arithmetic number, because the mean of its divisors is an integer number (36453607).

Almost surely, 2^72907213 is an apocalyptic number.

It is an amenable number.

72907213 is a deficient number, since it is larger than the sum of its proper divisors (1).

72907213 is an equidigital number, since it uses as much as digits as its factorization.

72907213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72907213 is about 8538.5720703171. The cubic root of 72907213 is about 417.7567722581.

The spelling of 72907213 in words is "seventy-two million, nine hundred seven thousand, two hundred thirteen".