28199880 has 64 divisors (see below), whose sum is σ = 94003200. Its totient is φ = 7519680.

The previous prime is 28199879. The next prime is 28199881. The reversal of 28199880 is 8899182.

It is an interprime number because it is at equal distance from previous prime (28199879) and next prime (28199881).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28199881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11976 + ... + 14135.

It is an arithmetic number, because the mean of its divisors is an integer number (1468800).

Almost surely, 2^28199880 is an apocalyptic number.

28199880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28199880 is an abundant number, since it is smaller than the sum of its proper divisors (65803320).

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

28199880 is a wasteful number, since it uses less digits than its factorization.

28199880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26131 (or 26121 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28199880 is about 5310.3559202750. The cubic root of 28199880 is about 304.3797481926.

The spelling of 28199880 in words is "twenty-eight million, one hundred ninety-nine thousand, eight hundred eighty".