28539290 has 16 divisors (see below), whose sum is σ = 55322568. Its totient is φ = 10537536.

The previous prime is 28539289. The next prime is 28539337. The reversal of 28539290 is 9293582.

It can be written as a sum of positive squares in 4 ways, for example, as 25230529 + 3308761 = 5023^2 + 1819^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109637 + ... + 109896.

Almost surely, 2^28539290 is an apocalyptic number.

28539290 is a deficient number, since it is larger than the sum of its proper divisors (26783278).

28539290 is a wasteful number, since it uses less digits than its factorization.

28539290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219553.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28539290 is about 5342.2177042872. The cubic root of 28539290 is about 305.5960394967.

The spelling of 28539290 in words is "twenty-eight million, five hundred thirty-nine thousand, two hundred ninety".