28459990 has 16 divisors (see below), whose sum is σ = 55168848. Its totient is φ = 10508256.

The previous prime is 28459979. The next prime is 28460011. The reversal of 28459990 is 9995482.

It is a self number, because there is not a number n which added to its sum of digits gives 28459990.

It is a congruent number.

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, 109332 + ... + 109591.

It is an arithmetic number, because the mean of its divisors is an integer number (3448053).

Almost surely, 2^28459990 is an apocalyptic number.

28459990 is a deficient number, since it is larger than the sum of its proper divisors (26708858).

28459990 is a wasteful number, since it uses less digits than its factorization.

28459990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218943.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 28459990 is about 5334.7905300958. The cubic root of 28459990 is about 305.3127312788.

The spelling of 28459990 in words is "twenty-eight million, four hundred fifty-nine thousand, nine hundred ninety".