28647644 has 12 divisors (see below), whose sum is σ = 50529024. Its totient is φ = 14210784.

The previous prime is 28647637. The next prime is 28647667. The reversal of 28647644 is 44674682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27689 + ... + 28704.

It is an arithmetic number, because the mean of its divisors is an integer number (4210752).

Almost surely, 2^28647644 is an apocalyptic number.

It is an amenable number.

28647644 is a deficient number, since it is larger than the sum of its proper divisors (21881380).

28647644 is a wasteful number, since it uses less digits than its factorization.

28647644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56524 (or 56522 counting only the distinct ones).

The product of its digits is 258048, while the sum is 41.

The square root of 28647644 is about 5352.3493906882. The cubic root of 28647644 is about 305.9822992310.

The spelling of 28647644 in words is "twenty-eight million, six hundred forty-seven thousand, six hundred forty-four".