72861918 has 16 divisors (see below), whose sum is σ = 145810560. Its totient is φ = 24272856.

The previous prime is 72861913. The next prime is 72861947. The reversal of 72861918 is 81916827.

It is a self number, because there is not a number n which added to its sum of digits gives 72861918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72861911) 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, 13671 + ... + 18237.

It is an arithmetic number, because the mean of its divisors is an integer number (9113160).

Almost surely, 2^72861918 is an apocalyptic number.

72861918 is an abundant number, since it is smaller than the sum of its proper divisors (72948642).

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

72861918 is a wasteful number, since it uses less digits than its factorization.

72861918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231.

The product of its digits is 48384, while the sum is 42.

The square root of 72861918 is about 8535.9192826549. The cubic root of 72861918 is about 417.6702412086.

The spelling of 72861918 in words is "seventy-two million, eight hundred sixty-one thousand, nine hundred eighteen".