72170244 has 24 divisors (see below), whose sum is σ = 187108320. Its totient is φ = 24056712.

The previous prime is 72170221. The next prime is 72170249. The reversal of 72170244 is 44207127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (72170249) by changing a digit.

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, 334014 + ... + 334229.

It is an arithmetic number, because the mean of its divisors is an integer number (7796180).

Almost surely, 2^72170244 is an apocalyptic number.

It is an amenable number.

72170244 is an abundant number, since it is smaller than the sum of its proper divisors (114938076).

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

72170244 is a wasteful number, since it uses less digits than its factorization.

72170244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668256 (or 668248 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 72170244 is about 8495.3071751409. The cubic root of 72170244 is about 416.3443970636.

The spelling of 72170244 in words is "seventy-two million, one hundred seventy thousand, two hundred forty-four".