28456644 has 24 divisors (see below), whose sum is σ = 67525920. Its totient is φ = 9324544.

The previous prime is 28456643. The next prime is 28456651. The reversal of 28456644 is 44665482.

It is not an unprimeable number, because it can be changed into a prime (28456643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19389 + ... + 20804.

It is an arithmetic number, because the mean of its divisors is an integer number (2813580).

Almost surely, 2^28456644 is an apocalyptic number.

It is an amenable number.

28456644 is an abundant number, since it is smaller than the sum of its proper divisors (39069276).

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

28456644 is a wasteful number, since it uses less digits than its factorization.

28456644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40259 (or 40257 counting only the distinct ones).

The product of its digits is 184320, while the sum is 39.

The square root of 28456644 is about 5334.4769190615. The cubic root of 28456644 is about 305.3007657506.

The spelling of 28456644 in words is "twenty-eight million, four hundred fifty-six thousand, six hundred forty-four".