72327981 has 16 divisors (see below), whose sum is σ = 105500160. Its totient is φ = 43711920.

The previous prime is 72327973. The next prime is 72328033. The reversal of 72327981 is 18972327.

It is not a de Polignac number, because 72327981 - 2³ = 72327973 is a prime.

It is a super-2 number, since 2×72327981² = 10462673671072722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72327901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9616 + ... + 15398.

It is an arithmetic number, because the mean of its divisors is an integer number (6593760).

Almost surely, 2^72327981 is an apocalyptic number.

It is an amenable number.

72327981 is a deficient number, since it is larger than the sum of its proper divisors (33172179).

72327981 is a wasteful number, since it uses less digits than its factorization.

72327981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176.

The product of its digits is 42336, while the sum is 39.

The square root of 72327981 is about 8504.5858805706. The cubic root of 72327981 is about 416.6475004162.

The spelling of 72327981 in words is "seventy-two million, three hundred twenty-seven thousand, nine hundred eighty-one".