28199864 has 32 divisors (see below), whose sum is σ = 65923200. Its totient is φ = 10986720.

The previous prime is 28199837. The next prime is 28199879. The reversal of 28199864 is 46899182.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22274 + ... + 23505.

It is an arithmetic number, because the mean of its divisors is an integer number (2060100).

Almost surely, 2^28199864 is an apocalyptic number.

It is an amenable number.

28199864 is an abundant number, since it is smaller than the sum of its proper divisors (37723336).

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

28199864 is a wasteful number, since it uses less digits than its factorization.

28199864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45803 (or 45799 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 28199864 is about 5310.3544137845. The cubic root of 28199864 is about 304.3796906265.

The spelling of 28199864 in words is "twenty-eight million, one hundred ninety-nine thousand, eight hundred sixty-four".