72861856 has 24 divisors (see below), whose sum is σ = 146156724. Its totient is φ = 35742720.

The previous prime is 72861851. The next prime is 72861857. The reversal of 72861856 is 65816827.

It can be written as a sum of positive squares in 2 ways, for example, as 71978256 + 883600 = 8484^2 + 940^2 .

It is not an unprimeable number, because it can be changed into a prime (72861851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19785 + ... + 23176.

Almost surely, 2^72861856 is an apocalyptic number.

It is an amenable number.

72861856 is an abundant number, since it is smaller than the sum of its proper divisors (73294868).

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

72861856 is a wasteful number, since it uses less digits than its factorization.

72861856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43024 (or 43016 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 72861856 is about 8535.9156509422. The cubic root of 72861856 is about 417.6701227400.

The spelling of 72861856 in words is "seventy-two million, eight hundred sixty-one thousand, eight hundred fifty-six".