28869021 has 8 divisors (see below), whose sum is σ = 42768960. Its totient is φ = 19245996.

The previous prime is 28869017. The next prime is 28869023. The reversal of 28869021 is 12096882.

It is not a de Polignac number, because 28869021 - 2² = 28869017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28869023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534585 + ... + 534638.

It is an arithmetic number, because the mean of its divisors is an integer number (5346120).

Almost surely, 2^28869021 is an apocalyptic number.

It is an amenable number.

28869021 is a deficient number, since it is larger than the sum of its proper divisors (13899939).

28869021 is a wasteful number, since it uses less digits than its factorization.

28869021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069232 (or 1069226 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28869021 is about 5372.9899497393. The cubic root of 28869021 is about 306.7684453970.

The spelling of 28869021 in words is "twenty-eight million, eight hundred sixty-nine thousand, twenty-one".