72561870 has 48 divisors (see below), whose sum is σ = 189090720. Its totient is φ = 19305792.

The previous prime is 72561833. The next prime is 72561877. The reversal of 72561870 is 7816527.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72561877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64876 + ... + 65984.

It is an arithmetic number, because the mean of its divisors is an integer number (3939390).

Almost surely, 2^72561870 is an apocalyptic number.

72561870 is an abundant number, since it is smaller than the sum of its proper divisors (116528850).

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

72561870 is a wasteful number, since it uses less digits than its factorization.

72561870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1846 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 72561870 is about 8518.3255396821. The cubic root of 72561870 is about 417.0961253822.

The spelling of 72561870 in words is "seventy-two million, five hundred sixty-one thousand, eight hundred seventy".