72727157 has 6 divisors (see below), whose sum is σ = 75322338. Its totient is φ = 70218512.

The previous prime is 72727141. The next prime is 72727159. The reversal of 72727157 is 75172727.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 579121 + 72148036 = 761^2 + 8494^2 .

It is not a de Polignac number, because 72727157 - 2⁴ = 72727141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72727157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72727159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42398 + ... + 44079.

It is an arithmetic number, because the mean of its divisors is an integer number (12553723).

Almost surely, 2^72727157 is an apocalyptic number.

It is an amenable number.

72727157 is a deficient number, since it is larger than the sum of its proper divisors (2595181).

72727157 is an equidigital number, since it uses as much as digits as its factorization.

72727157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86535 (or 86506 counting only the distinct ones).

The product of its digits is 48020, while the sum is 38.

The square root of 72727157 is about 8528.0218691089. The cubic root of 72727157 is about 417.4125830818.

The spelling of 72727157 in words is "seventy-two million, seven hundred twenty-seven thousand, one hundred fifty-seven".