28644894 has 32 divisors (see below), whose sum is σ = 67008000. Its totient is φ = 9045432.

The previous prime is 28644887. The next prime is 28644901. The reversal of 28644894 is 49844682.

It is an interprime number because it is at equal distance from previous prime (28644887) and next prime (28644901).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12934 + ... + 14985.

It is an arithmetic number, because the mean of its divisors is an integer number (2094000).

Almost surely, 2^28644894 is an apocalyptic number.

28644894 is an abundant number, since it is smaller than the sum of its proper divisors (38363106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28644894 is a wasteful number, since it uses less digits than its factorization.

28644894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27949 (or 27943 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 28644894 is about 5352.0924879901. The cubic root of 28644894 is about 305.9725081030.

The spelling of 28644894 in words is "twenty-eight million, six hundred forty-four thousand, eight hundred ninety-four".