28239490 has 16 divisors (see below), whose sum is σ = 50948352. Its totient is φ = 11269744.

The previous prime is 28239487. The next prime is 28239509. The reversal of 28239490 is 9493282.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1647 + ... + 7693.

It is an arithmetic number, because the mean of its divisors is an integer number (3184272).

Almost surely, 2^28239490 is an apocalyptic number.

28239490 is a deficient number, since it is larger than the sum of its proper divisors (22708862).

28239490 is a wasteful number, since it uses less digits than its factorization.

28239490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28239490 is about 5314.0841167599. The cubic root of 28239490 is about 304.5221937316.

The spelling of 28239490 in words is "twenty-eight million, two hundred thirty-nine thousand, four hundred ninety".