28559988 has 18 divisors (see below), whose sum is σ = 72193394. Its totient is φ = 9519984.

The previous prime is 28559977. The next prime is 28560019. The reversal of 28559988 is 88995582.

28559988 is a `hidden beast` number, since 2 + 8 + 559 + 9 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 4235364 = 4932^2 + 2058^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396631 + ... + 396702.

Almost surely, 2^28559988 is an apocalyptic number.

It is an amenable number.

28559988 is an abundant number, since it is smaller than the sum of its proper divisors (43633406).

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

28559988 is a wasteful number, since it uses less digits than its factorization.

28559988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793343 (or 793338 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The square root of 28559988 is about 5344.1545636331. The cubic root of 28559988 is about 305.6698990581.

The spelling of 28559988 in words is "twenty-eight million, five hundred fifty-nine thousand, nine hundred eighty-eight".