28515290 has 32 divisors (see below), whose sum is σ = 55287360. Its totient is φ = 10549504.

The previous prime is 28515269. The next prime is 28515353. The reversal of 28515290 is 9251582.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8609 + ... + 11451.

It is an arithmetic number, because the mean of its divisors is an integer number (1727730).

Almost surely, 2^28515290 is an apocalyptic number.

28515290 is a deficient number, since it is larger than the sum of its proper divisors (26772070).

28515290 is a wasteful number, since it uses less digits than its factorization.

28515290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28515290 is about 5339.9709737039. The cubic root of 28515290 is about 305.5103522233.

The spelling of 28515290 in words is "twenty-eight million, five hundred fifteen thousand, two hundred ninety".