28090664 has 64 divisors (see below), whose sum is σ = 67132800. Its totient is φ = 10727424.

The previous prime is 28090663. The next prime is 28090669. The reversal of 28090664 is 46609082.

28090664 = T₂₄₅ + T₂₄₆ + ... + T₅₆₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28090663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17312 + ... + 18864.

It is an arithmetic number, because the mean of its divisors is an integer number (1048950).

Almost surely, 2^28090664 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 28090664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33566400).

28090664 is an abundant number, since it is smaller than the sum of its proper divisors (39042136).

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

28090664 is a wasteful number, since it uses less digits than its factorization.

28090664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602 (or 1598 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 28090664 is about 5300.0626411393. The cubic root of 28090664 is about 303.9862932416.

The spelling of 28090664 in words is "twenty-eight million, ninety thousand, six hundred sixty-four".