28207172 has 48 divisors (see below), whose sum is σ = 61031040. Its totient is φ = 11135232.

The previous prime is 28207159. The next prime is 28207181. The reversal of 28207172 is 27170282.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18968 + ... + 20400.

It is an arithmetic number, because the mean of its divisors is an integer number (1271480).

Almost surely, 2^28207172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28207172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30515520).

28207172 is an abundant number, since it is smaller than the sum of its proper divisors (32823868).

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

28207172 is a wasteful number, since it uses less digits than its factorization.

28207172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 28207172 is about 5311.0424588775. The cubic root of 28207172 is about 304.4059817066.

The spelling of 28207172 in words is "twenty-eight million, two hundred seven thousand, one hundred seventy-two".