72057986 has 32 divisors (see below), whose sum is σ = 145127808. Its totient is φ = 25914240.

The previous prime is 72057983. The next prime is 72057989. The reversal of 72057986 is 68975027.

It is an interprime number because it is at equal distance from previous prime (72057983) and next prime (72057989).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72057983) 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, 15995 + ... + 19998.

It is an arithmetic number, because the mean of its divisors is an integer number (4535244).

Almost surely, 2^72057986 is an apocalyptic number.

72057986 is an abundant number, since it is smaller than the sum of its proper divisors (73069822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72057986 is a wasteful number, since it uses less digits than its factorization.

72057986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36026.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 72057986 is about 8488.6975443822. The cubic root of 72057986 is about 416.1284158838.

The spelling of 72057986 in words is "seventy-two million, fifty-seven thousand, nine hundred eighty-six".