28398672 has 90 divisors (see below), whose sum is σ = 82325646. Its totient is φ = 9135360.

The previous prime is 28398661. The next prime is 28398677. The reversal of 28398672 is 27689382.

It can be written as a sum of positive squares in 3 ways, for example, as 266256 + 28132416 = 516^2 + 5304^2 .

Its product of digits (290304) is a multiple of the sum of its prime factors (189).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398677) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 465522 + ... + 465582.

Almost surely, 2^28398672 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 28398672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41162823).

28398672 is an abundant number, since it is smaller than the sum of its proper divisors (53926974).

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

28398672 is a wasteful number, since it uses less digits than its factorization.

28398672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 119 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28398672 is about 5329.0404389533. The cubic root of 28398672 is about 305.0933047869.

It can be divided in two parts, 2839 and 8672, that added together give a palindrome (11511).

The spelling of 28398672 in words is "twenty-eight million, three hundred ninety-eight thousand, six hundred seventy-two".