28172580 has 24 divisors (see below), whose sum is σ = 78883392. Its totient is φ = 7512672.

The previous prime is 28172579. The next prime is 28172581. The reversal of 28172580 is 8527182.

It is an interprime number because it is at equal distance from previous prime (28172579) and next prime (28172581).

It is not an unprimeable number, because it can be changed into a prime (28172581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234712 + ... + 234831.

It is an arithmetic number, because the mean of its divisors is an integer number (3286808).

Almost surely, 2^28172580 is an apocalyptic number.

28172580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28172580 is an abundant number, since it is smaller than the sum of its proper divisors (50710812).

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

28172580 is a wasteful number, since it uses less digits than its factorization.

28172580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469555 (or 469553 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28172580 is about 5307.7848486916. The cubic root of 28172580 is about 304.2814942280.

The spelling of 28172580 in words is "twenty-eight million, one hundred seventy-two thousand, five hundred eighty".