28004688 has 60 divisors (see below), whose sum is σ = 78730080. Its totient is φ = 9292608.

The previous prime is 28004663. The next prime is 28004693. The reversal of 28004688 is 88640082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62995 + ... + 63437.

It is an arithmetic number, because the mean of its divisors is an integer number (1312168).

Almost surely, 2^28004688 is an apocalyptic number.

It is an amenable number.

28004688 is an abundant number, since it is smaller than the sum of its proper divisors (50725392).

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

28004688 is a wasteful number, since it uses less digits than its factorization.

28004688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 28004688 is about 5291.9455779515. The cubic root of 28004688 is about 303.6758433003.

The spelling of 28004688 in words is "twenty-eight million, four thousand, six hundred eighty-eight".