72715897 has 2 divisors, whose sum is σ = 72715898. Its totient is φ = 72715896.

The previous prime is 72715891. The next prime is 72715913. The reversal of 72715897 is 79851727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70492816 + 2223081 = 8396^2 + 1491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72715897 is a prime.

It is not a weakly prime, because it can be changed into another prime (72715891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36357948 + 36357949.

It is an arithmetic number, because the mean of its divisors is an integer number (36357949).

Almost surely, 2^72715897 is an apocalyptic number.

It is an amenable number.

72715897 is a deficient number, since it is larger than the sum of its proper divisors (1).

72715897 is an equidigital number, since it uses as much as digits as its factorization.

72715897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 72715897 is about 8527.3616670105. The cubic root of 72715897 is about 417.3910399680.

It can be divided in two parts, 7 and 2715897, that added together give a square (2715904 = 1648²).

The spelling of 72715897 in words is "seventy-two million, seven hundred fifteen thousand, eight hundred ninety-seven".