28389998 has 32 divisors (see below), whose sum is σ = 52678080. Its totient is φ = 11174400.

The previous prime is 28389979. The next prime is 28390001. The reversal of 28389998 is 89998382.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 70598 + ... + 70998.

It is an arithmetic number, because the mean of its divisors is an integer number (1646190).

Almost surely, 2^28389998 is an apocalyptic number.

28389998 is a deficient number, since it is larger than the sum of its proper divisors (24288082).

28389998 is a wasteful number, since it uses less digits than its factorization.

28389998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 2239488, while the sum is 56.

The square root of 28389998 is about 5328.2265342232. The cubic root of 28389998 is about 305.0622393811.

The spelling of 28389998 in words is "twenty-eight million, three hundred eighty-nine thousand, nine hundred ninety-eight".