28172512 has 24 divisors (see below), whose sum is σ = 55585656. Its totient is φ = 14055552.

The previous prime is 28172479. The next prime is 28172513. The reversal of 28172512 is 21527182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28172513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23643 + ... + 24805.

It is an arithmetic number, because the mean of its divisors is an integer number (2316069).

Almost surely, 2^28172512 is an apocalyptic number.

It is an amenable number.

28172512 is a deficient number, since it is larger than the sum of its proper divisors (27413144).

28172512 is a wasteful number, since it uses less digits than its factorization.

28172512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930 (or 1922 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 28172512 is about 5307.7784430023. The cubic root of 28172512 is about 304.2812494136.

Adding to 28172512 its reverse (21527182), we get a palindrome (49699694).

It can be divided in two parts, 2817 and 2512, that added together give a square (5329 = 73²).

The spelling of 28172512 in words is "twenty-eight million, one hundred seventy-two thousand, five hundred twelve".