28399572 has 120 divisors (see below), whose sum is σ = 80336256. Its totient is φ = 8724672.

The previous prime is 28399559. The next prime is 28399589. The reversal of 28399572 is 27599382.

Its product of digits (272160) is a multiple of the sum of its prime divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 275673 + ... + 275775.

Almost surely, 2^28399572 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 28399572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40168128).

28399572 is an abundant number, since it is smaller than the sum of its proper divisors (51936684).

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

28399572 is a wasteful number, since it uses less digits than its factorization.

28399572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 168 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 28399572 is about 5329.1248812540. The cubic root of 28399572 is about 305.0965277201.

The spelling of 28399572 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred seventy-two".