28989428 has 12 divisors (see below), whose sum is σ = 54634020. Its totient is φ = 13379712.

The previous prime is 28989427. The next prime is 28989451. The reversal of 28989428 is 82498982.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 25989604 = 1732^2 + 5098^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28989427) 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, 278693 + ... + 278796.

It is an arithmetic number, because the mean of its divisors is an integer number (4552835).

Almost surely, 2^28989428 is an apocalyptic number.

It is an amenable number.

28989428 is a deficient number, since it is larger than the sum of its proper divisors (25644592).

28989428 is a wasteful number, since it uses less digits than its factorization.

28989428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557506 (or 557504 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 28989428 is about 5384.1831321009. The cubic root of 28989428 is about 307.1943440844.

The spelling of 28989428 in words is "twenty-eight million, nine hundred eighty-nine thousand, four hundred twenty-eight".