28097188 has 24 divisors (see below), whose sum is σ = 57344000. Its totient is φ = 12041064.

The previous prime is 28097183. The next prime is 28097203. The reversal of 28097188 is 88179082.

It is not an unprimeable number, because it can be changed into a prime (28097183) 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 7 ways as a sum of consecutive naturals, for example, 8868 + ... + 11611.

Almost surely, 2^28097188 is an apocalyptic number.

28097188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28097188 is an abundant number, since it is smaller than the sum of its proper divisors (29246812).

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

28097188 is a wasteful number, since it uses less digits than its factorization.

28097188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20504 (or 20488 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 28097188 is about 5300.6780698322. The cubic root of 28097188 is about 304.0098248210.

The spelling of 28097188 in words is "twenty-eight million, ninety-seven thousand, one hundred eighty-eight".