72157766 has 16 divisors (see below), whose sum is σ = 109430880. Its totient is φ = 35683200.

The previous prime is 72157747. The next prime is 72157769. The reversal of 72157766 is 66775127.

It is a super-2 number, since 2×72157766² = 10413486388221512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72157769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101420 + ... + 102128.

It is an arithmetic number, because the mean of its divisors is an integer number (6839430).

Almost surely, 2^72157766 is an apocalyptic number.

72157766 is a deficient number, since it is larger than the sum of its proper divisors (37273114).

72157766 is a wasteful number, since it uses less digits than its factorization.

72157766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199.

The product of its digits is 123480, while the sum is 41.

The square root of 72157766 is about 8494.5727379310. The cubic root of 72157766 is about 416.3204008174.

The spelling of 72157766 in words is "seventy-two million, one hundred fifty-seven thousand, seven hundred sixty-six".