28408590 has 64 divisors (see below), whose sum is σ = 86584320. Its totient is φ = 6492960.

The previous prime is 28408577. The next prime is 28408609. The reversal of 28408590 is 9580482.

28408590 is a `hidden beast` number, since 28 + 40 + 8 + 590 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5626 + ... + 9405.

It is an arithmetic number, because the mean of its divisors is an integer number (1352880).

Almost surely, 2^28408590 is an apocalyptic number.

28408590 is an abundant number, since it is smaller than the sum of its proper divisors (58175730).

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

28408590 is a wasteful number, since it uses less digits than its factorization.

28408590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15054 (or 15048 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28408590 is about 5329.9709192452. The cubic root of 28408590 is about 305.1288177527.

The spelling of 28408590 in words is "twenty-eight million, four hundred eight thousand, five hundred ninety".