72561418 has 16 divisors (see below), whose sum is σ = 114801120. Its totient is φ = 34302096.

The previous prime is 72561407. The next prime is 72561427. The reversal of 72561418 is 81416527.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20680 + ... + 23932.

It is an arithmetic number, because the mean of its divisors is an integer number (7175070).

Almost surely, 2^72561418 is an apocalyptic number.

72561418 is a deficient number, since it is larger than the sum of its proper divisors (42239702).

72561418 is a wasteful number, since it uses less digits than its factorization.

72561418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861.

The product of its digits is 13440, while the sum is 34.

The square root of 72561418 is about 8518.2990086049. The cubic root of 72561418 is about 417.0952593266.

The spelling of 72561418 in words is "seventy-two million, five hundred sixty-one thousand, four hundred eighteen".