28247664 has 20 divisors (see below), whose sum is σ = 72973256. Its totient is φ = 9415872.

The previous prime is 28247651. The next prime is 28247671. The reversal of 28247664 is 46674282.

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, 294199 + ... + 294294.

Almost surely, 2^28247664 is an apocalyptic number.

28247664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28247664 is an abundant number, since it is smaller than the sum of its proper divisors (44725592).

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

28247664 is a wasteful number, since it uses less digits than its factorization.

28247664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588504 (or 588498 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The square root of 28247664 is about 5314.8531494294. The cubic root of 28247664 is about 304.5515724997.

The spelling of 28247664 in words is "twenty-eight million, two hundred forty-seven thousand, six hundred sixty-four".