28515172 has 48 divisors (see below), whose sum is σ = 59552640. Its totient is φ = 11692800.

The previous prime is 28515167. The next prime is 28515203. The reversal of 28515172 is 27151582.

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 15 ways as a sum of consecutive naturals, for example, 67522 + ... + 67942.

It is an arithmetic number, because the mean of its divisors is an integer number (1240680).

Almost surely, 2^28515172 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 28515172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29776320).

28515172 is an abundant number, since it is smaller than the sum of its proper divisors (31037468).

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

28515172 is a wasteful number, since it uses less digits than its factorization.

28515172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 530 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 28515172 is about 5339.9599249433. The cubic root of 28515172 is about 305.5099308088.

The spelling of 28515172 in words is "twenty-eight million, five hundred fifteen thousand, one hundred seventy-two".