28932889 has 4 divisors (see below), whose sum is σ = 29866240. Its totient is φ = 27999540.

The previous prime is 28932863. The next prime is 28932901. The reversal of 28932889 is 98823982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28932889 - 2⁹ = 28932377 is a prime.

It is a super-2 number, since 2×28932889² = 1674224131772642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28935889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466629 + ... + 466690.

It is an arithmetic number, because the mean of its divisors is an integer number (7466560).

Almost surely, 2^28932889 is an apocalyptic number.

It is an amenable number.

28932889 is a deficient number, since it is larger than the sum of its proper divisors (933351).

28932889 is an equidigital number, since it uses as much as digits as its factorization.

28932889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933350.

The product of its digits is 497664, while the sum is 49.

The square root of 28932889 is about 5378.9300980771. The cubic root of 28932889 is about 306.9945038221.

The spelling of 28932889 in words is "twenty-eight million, nine hundred thirty-two thousand, eight hundred eighty-nine".