72157737 has 8 divisors (see below), whose sum is σ = 98257536. Its totient is φ = 47081552.

The previous prime is 72157721. The next prime is 72157747. The reversal of 72157737 is 73775127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72157737 - 2⁴ = 72157721 is a prime.

It is a super-2 number, since 2×72157737² = 10413478017922338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72157695 and 72157704.

It is not an unprimeable number, because it can be changed into a prime (72157747) 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, 255738 + ... + 256019.

It is an arithmetic number, because the mean of its divisors is an integer number (12282192).

Almost surely, 2^72157737 is an apocalyptic number.

It is an amenable number.

72157737 is a deficient number, since it is larger than the sum of its proper divisors (26099799).

72157737 is a wasteful number, since it uses less digits than its factorization.

72157737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511807.

The product of its digits is 72030, while the sum is 39.

The square root of 72157737 is about 8494.5710309585. The cubic root of 72157737 is about 416.3203450447.

The spelling of 72157737 in words is "seventy-two million, one hundred fifty-seven thousand, seven hundred thirty-seven".