28372399 has 16 divisors (see below), whose sum is σ = 31808160. Its totient is φ = 25090560.

The previous prime is 28372397. The next prime is 28372417. The reversal of 28372399 is 99327382.

It is a happy number.

It is not a de Polignac number, because 28372399 - 2¹ = 28372397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28372397) 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, 71269 + ... + 71665.

It is an arithmetic number, because the mean of its divisors is an integer number (1988010).

Almost surely, 2^28372399 is an apocalyptic number.

28372399 is a deficient number, since it is larger than the sum of its proper divisors (3435761).

28372399 is a wasteful number, since it uses less digits than its factorization.

28372399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its digits is 163296, while the sum is 43.

The square root of 28372399 is about 5326.5747906136. The cubic root of 28372399 is about 304.9991901797. Note that the first 3 decimals are identical.

The spelling of 28372399 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred ninety-nine".