28900919 has 16 divisors (see below), whose sum is σ = 31399680. Its totient is φ = 26516160.

The previous prime is 28900913. The next prime is 28900939. The reversal of 28900919 is 91900982.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28900919 is a prime.

It is a super-2 number, since 2×28900919² = 1670526238089122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28900913) 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 15 ways as a sum of consecutive naturals, for example, 92774 + ... + 93084.

It is an arithmetic number, because the mean of its divisors is an integer number (1962480).

Almost surely, 2^28900919 is an apocalyptic number.

28900919 is a deficient number, since it is larger than the sum of its proper divisors (2498761).

28900919 is a wasteful number, since it uses less digits than its factorization.

28900919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 28900919 is about 5375.9574961117. The cubic root of 28900919 is about 306.8813888193.

The spelling of 28900919 in words is "twenty-eight million, nine hundred thousand, nine hundred nineteen".