28172088 has 48 divisors (see below), whose sum is σ = 87200880. Its totient is φ = 8049024.

The previous prime is 28172069. The next prime is 28172147. The reversal of 28172088 is 88027182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27445 + ... + 28452.

It is an arithmetic number, because the mean of its divisors is an integer number (1816685).

Almost surely, 2^28172088 is an apocalyptic number.

28172088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28172088 is an abundant number, since it is smaller than the sum of its proper divisors (59028792).

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

28172088 is a wasteful number, since it uses less digits than its factorization.

28172088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55916 (or 55909 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28172088 is about 5307.7385014712. The cubic root of 28172088 is about 304.2797229151.

The spelling of 28172088 in words is "twenty-eight million, one hundred seventy-two thousand, eighty-eight".