72223172 has 12 divisors (see below), whose sum is σ = 144446400. Its totient is φ = 30952776.

The previous prime is 72223147. The next prime is 72223213. The reversal of 72223172 is 27132227.

72223172 is an admirable 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, 1289672 + ... + 1289727.

It is an arithmetic number, because the mean of its divisors is an integer number (12037200).

Almost surely, 2^72223172 is an apocalyptic number.

It is an amenable number.

72223172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72223172 is a wasteful number, since it uses less digits than its factorization.

72223172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579410 (or 2579408 counting only the distinct ones).

The product of its digits is 2352, while the sum is 26.

The square root of 72223172 is about 8498.4217358284. The cubic root of 72223172 is about 416.4461513335.

Adding to 72223172 its reverse (27132227), we get a palindrome (99355399).

The spelling of 72223172 in words is "seventy-two million, two hundred twenty-three thousand, one hundred seventy-two".