28708990 has 8 divisors (see below), whose sum is σ = 51676200. Its totient is φ = 11483592.

The previous prime is 28708961. The next prime is 28709011. The reversal of 28708990 is 9980782.

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

It is a super-2 number, since 2×28708990² = 1648412213640200, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1435440 + ... + 1435459.

It is an arithmetic number, because the mean of its divisors is an integer number (6459525).

Almost surely, 2^28708990 is an apocalyptic number.

28708990 is a deficient number, since it is larger than the sum of its proper divisors (22967210).

28708990 is a wasteful number, since it uses less digits than its factorization.

28708990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870906.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 28708990 is about 5358.0770804459. The cubic root of 28708990 is about 306.2005534496.

The spelling of 28708990 in words is "twenty-eight million, seven hundred eight thousand, nine hundred ninety".