72171444 has 12 divisors (see below), whose sum is σ = 168400064. Its totient is φ = 24057144.

The previous prime is 72171413. The next prime is 72171457. The reversal of 72171444 is 44417127.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3007132 + ... + 3007155.

Almost surely, 2^72171444 is an apocalyptic number.

It is an amenable number.

72171444 is an abundant number, since it is smaller than the sum of its proper divisors (96228620).

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

72171444 is a wasteful number, since it uses less digits than its factorization.

72171444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6014294 (or 6014292 counting only the distinct ones).

The product of its digits is 6272, while the sum is 30.

The square root of 72171444 is about 8495.3778020757. The cubic root of 72171444 is about 416.3467046190.

The spelling of 72171444 in words is "seventy-two million, one hundred seventy-one thousand, four hundred forty-four".