28398972 has 48 divisors (see below), whose sum is σ = 76108032. Its totient is φ = 8073600.

The previous prime is 28398961. The next prime is 28398973. The reversal of 28398972 is 27989382.

It is a happy number.

It is a super-2 number, since 2×28398972² = 1613003221313568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18847 + ... + 20297.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^28398972 is an apocalyptic number.

It is an amenable number.

28398972 is an abundant number, since it is smaller than the sum of its proper divisors (47709060).

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

28398972 is a wasteful number, since it uses less digits than its factorization.

28398972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698 (or 1696 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 28398972 is about 5329.0685865355. The cubic root of 28398972 is about 305.0943791055.

It can be divided in two parts, 2839 and 8972, that added together give a palindrome (11811).

The spelling of 28398972 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred seventy-two".