72164444 has 24 divisors (see below), whose sum is σ = 138029808. Its totient is φ = 32739840.

The previous prime is 72164423. The next prime is 72164459. The reversal of 72164444 is 44446127.

It is a self number, because there is not a number n which added to its sum of digits gives 72164444.

It is a congruent number.

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, 28394 + ... + 30830.

It is an arithmetic number, because the mean of its divisors is an integer number (5751242).

Almost surely, 2^72164444 is an apocalyptic number.

It is an amenable number.

72164444 is a deficient number, since it is larger than the sum of its proper divisors (65865364).

72164444 is a wasteful number, since it uses less digits than its factorization.

72164444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125 (or 3123 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 72164444 is about 8494.9658033449. The cubic root of 72164444 is about 416.3332435186. Note that the first 3 decimals are identical.

The spelling of 72164444 in words is "seventy-two million, one hundred sixty-four thousand, four hundred forty-four".