28990869 has 16 divisors (see below), whose sum is σ = 40551168. Its totient is φ = 18401472.

The previous prime is 28990861. The next prime is 28990877. The reversal of 28990869 is 96809982.

It is an interprime number because it is at equal distance from previous prime (28990861) and next prime (28990877).

It is not a de Polignac number, because 28990869 - 2³ = 28990861 is a prime.

It is a super-2 number, since 2×28990869² = 1680940970750322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2439 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (2534448).

Almost surely, 2^28990869 is an apocalyptic number.

It is an amenable number.

28990869 is a deficient number, since it is larger than the sum of its proper divisors (11560299).

28990869 is a wasteful number, since it uses less digits than its factorization.

28990869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5644.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 28990869 is about 5384.3169483232. The cubic root of 28990869 is about 307.1994339827.

The spelling of 28990869 in words is "twenty-eight million, nine hundred ninety thousand, eight hundred sixty-nine".