72172375 has 16 divisors (see below), whose sum is σ = 98261280. Its totient is φ = 52488000.

The previous prime is 72172363. The next prime is 72172391. The reversal of 72172375 is 57327127.

It is a happy number.

It is not a de Polignac number, because 72172375 - 2⁵ = 72172343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72172375.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 24870 + ... + 27619.

It is an arithmetic number, because the mean of its divisors is an integer number (6141330).

Almost surely, 2^72172375 is an apocalyptic number.

72172375 is a deficient number, since it is larger than the sum of its proper divisors (26088905).

72172375 is a wasteful number, since it uses less digits than its factorization.

72172375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52515 (or 52505 counting only the distinct ones).

The product of its digits is 20580, while the sum is 34.

The square root of 72172375 is about 8495.4325964014. The cubic root of 72172375 is about 416.3484948797.

The spelling of 72172375 in words is "seventy-two million, one hundred seventy-two thousand, three hundred seventy-five".