28066590 has 48 divisors (see below), whose sum is σ = 73389888. Its totient is φ = 7441728.

The previous prime is 28066589. The next prime is 28066603. The reversal of 28066590 is 9566082.

28066590 is a `hidden beast` number, since 2 + 8 + 0 + 66 + 590 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16939 + ... + 18521.

It is an arithmetic number, because the mean of its divisors is an integer number (1528956).

Almost surely, 2^28066590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28066590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36694944).

28066590 is an abundant number, since it is smaller than the sum of its proper divisors (45323298).

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

28066590 is a wasteful number, since it uses less digits than its factorization.

28066590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1790 counting only the distinct ones).

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

The square root of 28066590 is about 5297.7910491072. The cubic root of 28066590 is about 303.8994285856.

The spelling of 28066590 in words is "twenty-eight million, sixty-six thousand, five hundred ninety".