28641789 has 32 divisors (see below), whose sum is σ = 46730880. Its totient is φ = 17336880.

The previous prime is 28641751. The next prime is 28641793. The reversal of 28641789 is 98714682.

It is not a de Polignac number, because 28641789 - 2⁸ = 28641533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28641989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35539 + ... + 36335.

It is an arithmetic number, because the mean of its divisors is an integer number (1460340).

Almost surely, 2^28641789 is an apocalyptic number.

It is an amenable number.

28641789 is a deficient number, since it is larger than the sum of its proper divisors (18089091).

28641789 is an equidigital number, since it uses as much as digits as its factorization.

28641789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 811 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28641789 is about 5351.8024066664. The cubic root of 28641789 is about 305.9614522761.

The spelling of 28641789 in words is "twenty-eight million, six hundred forty-one thousand, seven hundred eighty-nine".