28475172 has 72 divisors (see below), whose sum is σ = 81183200. Its totient is φ = 8624880.

The previous prime is 28475149. The next prime is 28475191. The reversal of 28475172 is 27157482.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11979 + ... + 14157.

Almost surely, 2^28475172 is an apocalyptic number.

28475172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28475172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40591600).

28475172 is an abundant number, since it is smaller than the sum of its proper divisors (52708028).

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

28475172 is a wasteful number, since it uses less digits than its factorization.

28475172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214 (or 2195 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 28475172 is about 5336.2132641041. The cubic root of 28475172 is about 305.3670113858.

The spelling of 28475172 in words is "twenty-eight million, four hundred seventy-five thousand, one hundred seventy-two".