72715913 has 2 divisors, whose sum is σ = 72715914. Its totient is φ = 72715912.

The previous prime is 72715897. The next prime is 72715921. The reversal of 72715913 is 31951727.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56370064 + 16345849 = 7508^2 + 4043^2 .

It is an emirp because it is prime and its reverse (31951727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72715913 - 2⁴ = 72715897 is a prime.

It is not a weakly prime, because it can be changed into another prime (72715813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36357956 + 36357957.

It is an arithmetic number, because the mean of its divisors is an integer number (36357957).

Almost surely, 2^72715913 is an apocalyptic number.

It is an amenable number.

72715913 is a deficient number, since it is larger than the sum of its proper divisors (1).

72715913 is an equidigital number, since it uses as much as digits as its factorization.

72715913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 35.

The square root of 72715913 is about 8527.3626051670. The cubic root of 72715913 is about 417.3910705814.

The spelling of 72715913 in words is "seventy-two million, seven hundred fifteen thousand, nine hundred thirteen".