28489688 has 32 divisors (see below), whose sum is σ = 56842560. Its totient is φ = 13340160.

The previous prime is 28489649. The next prime is 28489723. The reversal of 28489688 is 88698482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36470 + ... + 37242.

It is an arithmetic number, because the mean of its divisors is an integer number (1776330).

Almost surely, 2^28489688 is an apocalyptic number.

It is an amenable number.

28489688 is a deficient number, since it is larger than the sum of its proper divisors (28352872).

28489688 is a wasteful number, since it uses less digits than its factorization.

28489688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1063 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 53.

The square root of 28489688 is about 5337.5732313477. The cubic root of 28489688 is about 305.4188923076.

The spelling of 28489688 in words is "twenty-eight million, four hundred eighty-nine thousand, six hundred eighty-eight".