72615157 has 2 divisors, whose sum is σ = 72615158. Its totient is φ = 72615156.

The previous prime is 72615133. The next prime is 72615161. The reversal of 72615157 is 75151627.

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., 62078641 + 10536516 = 7879^2 + 3246^2 .

It is an emirp because it is prime and its reverse (75151627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72615157 - 2⁷ = 72615029 is a prime.

It is a super-2 number, since 2×72615157² = 10545922052269298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72615167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36307578 + 36307579.

It is an arithmetic number, because the mean of its divisors is an integer number (36307579).

Almost surely, 2^72615157 is an apocalyptic number.

It is an amenable number.

72615157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72615157 is an equidigital number, since it uses as much as digits as its factorization.

72615157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 34.

The square root of 72615157 is about 8521.4527517319. The cubic root of 72615157 is about 417.1982008608.

The spelling of 72615157 in words is "seventy-two million, six hundred fifteen thousand, one hundred fifty-seven".