28122172 has 24 divisors (see below), whose sum is σ = 54236336. Its totient is φ = 12676608.

The previous prime is 28122161. The next prime is 28122191. The reversal of 28122172 is 27122182.

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 7 ways as a sum of consecutive naturals, for example, 4053 + ... + 8524.

Almost surely, 2^28122172 is an apocalyptic number.

It is an amenable number.

28122172 is a deficient number, since it is larger than the sum of its proper divisors (26114164).

28122172 is a wasteful number, since it uses less digits than its factorization.

28122172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12637 (or 12635 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 28122172 is about 5303.0342257994. The cubic root of 28122172 is about 304.0999065675.

The spelling of 28122172 in words is "twenty-eight million, one hundred twenty-two thousand, one hundred seventy-two".