72331881 has 8 divisors (see below), whose sum is σ = 96564960. Its totient is φ = 48160032.

The previous prime is 72331877. The next prime is 72331921. The reversal of 72331881 is 18813327.

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

It is not a de Polignac number, because 72331881 - 2² = 72331877 is a prime.

It is a super-2 number, since 2×72331881² = 10463802017996322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72331801) 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, 12475 + ... + 17328.

It is an arithmetic number, because the mean of its divisors is an integer number (12070620).

Almost surely, 2^72331881 is an apocalyptic number.

It is an amenable number.

72331881 is a deficient number, since it is larger than the sum of its proper divisors (24233079).

72331881 is a wasteful number, since it uses less digits than its factorization.

72331881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30615.

The product of its digits is 8064, while the sum is 33.

The square root of 72331881 is about 8504.8151655400. The cubic root of 72331881 is about 416.6549889705.

The spelling of 72331881 in words is "seventy-two million, three hundred thirty-one thousand, eight hundred eighty-one".