28090656 has 72 divisors (see below), whose sum is σ = 87154704. Its totient is φ = 8511360.

The previous prime is 28090639. The next prime is 28090663. The reversal of 28090656 is 65609082.

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28090656.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (1210482).

Almost surely, 2^28090656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28090656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43577352).

28090656 is an abundant number, since it is smaller than the sum of its proper divisors (59064048).

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

28090656 is a wasteful number, since it uses less digits than its factorization.

28090656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8894 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 28090656 is about 5300.0618864311. The cubic root of 28090656 is about 303.9862643840.

The spelling of 28090656 in words is "twenty-eight million, ninety thousand, six hundred fifty-six".