28398172 has 24 divisors (see below), whose sum is σ = 54360432. Its totient is φ = 12873600.

The previous prime is 28398157. The next prime is 28398173. The reversal of 28398172 is 27189382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23208 + ... + 24400.

It is an arithmetic number, because the mean of its divisors is an integer number (2265018).

Almost surely, 2^28398172 is an apocalyptic number.

28398172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28398172 is a deficient number, since it is larger than the sum of its proper divisors (25962260).

28398172 is a wasteful number, since it uses less digits than its factorization.

28398172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1747 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 28398172 is about 5328.9935259859. The cubic root of 28398172 is about 305.0915142390.

It can be divided in two parts, 2839 and 8172, that added together give a palindrome (11011).

The spelling of 28398172 in words is "twenty-eight million, three hundred ninety-eight thousand, one hundred seventy-two".