72707331 has 8 divisors (see below), whose sum is σ = 99563344. Its totient is φ = 47161440.

The previous prime is 72707287. The next prime is 72707333. The reversal of 72707331 is 13370727.

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

It is not a de Polignac number, because 72707331 - 2⁹ = 72706819 is a prime.

It is a super-2 number, since 2×72707331² = 10572711962287122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72707333) 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, 327400 + ... + 327621.

It is an arithmetic number, because the mean of its divisors is an integer number (12445418).

Almost surely, 2^72707331 is an apocalyptic number.

72707331 is a deficient number, since it is larger than the sum of its proper divisors (26856013).

72707331 is a wasteful number, since it uses less digits than its factorization.

72707331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655061.

The product of its (nonzero) digits is 6174, while the sum is 30.

The square root of 72707331 is about 8526.8593866675. The cubic root of 72707331 is about 417.3746496407.

The spelling of 72707331 in words is "seventy-two million, seven hundred seven thousand, three hundred thirty-one".