28172612 has 12 divisors (see below), whose sum is σ = 53094636. Its totient is φ = 13002720.

The previous prime is 28172609. The next prime is 28172633. The reversal of 28172612 is 21627182.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 10666756 = 4184^2 + 3266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270839 + ... + 270942.

It is an arithmetic number, because the mean of its divisors is an integer number (4424553).

Almost surely, 2^28172612 is an apocalyptic number.

It is an amenable number.

28172612 is a deficient number, since it is larger than the sum of its proper divisors (24922024).

28172612 is a wasteful number, since it uses less digits than its factorization.

28172612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541798 (or 541796 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 28172612 is about 5307.7878631309. The cubic root of 28172612 is about 304.2816094346.

Adding to 28172612 its reverse (21627182), we get a palindrome (49799794).

The spelling of 28172612 in words is "twenty-eight million, one hundred seventy-two thousand, six hundred twelve".