28168890 has 16 divisors (see below), whose sum is σ = 67605408. Its totient is φ = 7511696.

The previous prime is 28168883. The next prime is 28168891. The reversal of 28168890 is 9886182.

It is not an unprimeable number, because it can be changed into a prime (28168891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469452 + ... + 469511.

It is an arithmetic number, because the mean of its divisors is an integer number (4225338).

Almost surely, 2^28168890 is an apocalyptic number.

28168890 is an abundant number, since it is smaller than the sum of its proper divisors (39436518).

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

28168890 is a wasteful number, since it uses less digits than its factorization.

28168890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938973.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28168890 is about 5307.4372346736. The cubic root of 28168890 is about 304.2682088782.

The spelling of 28168890 in words is "twenty-eight million, one hundred sixty-eight thousand, eight hundred ninety".