72181608 has 32 divisors (see below), whose sum is σ = 189952800. Its totient is φ = 22794048.

The previous prime is 72181591. The next prime is 72181621. The reversal of 72181608 is 80618127.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 78691 + ... + 79602.

It is an arithmetic number, because the mean of its divisors is an integer number (5936025).

Almost surely, 2^72181608 is an apocalyptic number.

It is an amenable number.

72181608 is an abundant number, since it is smaller than the sum of its proper divisors (117771192).

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

72181608 is a wasteful number, since it uses less digits than its factorization.

72181608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158321 (or 158317 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 72181608 is about 8495.9759886666. The cubic root of 72181608 is about 416.3662485874.

The spelling of 72181608 in words is "seventy-two million, one hundred eighty-one thousand, six hundred eight".