28399408 has 20 divisors (see below), whose sum is σ = 55317888. Its totient is φ = 14123840.

The previous prime is 28399403. The next prime is 28399447. The reversal of 28399408 is 80499382.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28399403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1591 + ... + 7702.

Almost surely, 2^28399408 is an apocalyptic number.

It is an amenable number.

28399408 is a deficient number, since it is larger than the sum of its proper divisors (26918480).

28399408 is a wasteful number, since it uses less digits than its factorization.

28399408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492 (or 9486 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 28399408 is about 5329.1094940900. The cubic root of 28399408 is about 305.0959404351.

The spelling of 28399408 in words is "twenty-eight million, three hundred ninety-nine thousand, four hundred eight".