28790990 has 8 divisors (see below), whose sum is σ = 51823800. Its totient is φ = 11516392.

The previous prime is 28790989. The next prime is 28791001. The reversal of 28790990 is 9909782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28790990² = 1657842210360200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439540 + ... + 1439559.

It is an arithmetic number, because the mean of its divisors is an integer number (6477975).

Almost surely, 2^28790990 is an apocalyptic number.

28790990 is a deficient number, since it is larger than the sum of its proper divisors (23032810).

28790990 is a wasteful number, since it uses less digits than its factorization.

28790990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879106.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 28790990 is about 5365.7236231472. The cubic root of 28790990 is about 306.4918045865.

The spelling of 28790990 in words is "twenty-eight million, seven hundred ninety thousand, nine hundred ninety".