28990188 has 36 divisors (see below), whose sum is σ = 73779888. Its totient is φ = 9597600.

The previous prime is 28990187. The next prime is 28990193. The reversal of 28990188 is 88109982.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28990187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2770 + ... + 8102.

Almost surely, 2^28990188 is an apocalyptic number.

It is an amenable number.

28990188 is an abundant number, since it is smaller than the sum of its proper divisors (44789700).

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

28990188 is a wasteful number, since it uses less digits than its factorization.

28990188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5494 (or 5489 counting only the distinct ones).

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

The square root of 28990188 is about 5384.2537087325. The cubic root of 28990188 is about 307.1970285764.

The spelling of 28990188 in words is "twenty-eight million, nine hundred ninety thousand, one hundred eighty-eight".