28290899 has 8 divisors (see below), whose sum is σ = 34819680. Its totient is φ = 22383936.

The previous prime is 28290893. The next prime is 28290917. The reversal of 28290899 is 99809282.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28290899 - 2⁴ = 28290883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28290893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155354 + ... + 155535.

It is an arithmetic number, because the mean of its divisors is an integer number (4352460).

Almost surely, 2^28290899 is an apocalyptic number.

28290899 is a deficient number, since it is larger than the sum of its proper divisors (6528781).

28290899 is a wasteful number, since it uses less digits than its factorization.

28290899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310909.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28290899 is about 5318.9189691139. The cubic root of 28290899 is about 304.7068723637.

The spelling of 28290899 in words is "twenty-eight million, two hundred ninety thousand, eight hundred ninety-nine".