28644272 has 20 divisors (see below), whose sum is σ = 55610280. Its totient is φ = 14293248.

The previous prime is 28644271. The next prime is 28644277. The reversal of 28644272 is 27244682.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28644271) 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, 7979 + ... + 10997.

It is an arithmetic number, because the mean of its divisors is an integer number (2780514).

Almost surely, 2^28644272 is an apocalyptic number.

It is an amenable number.

28644272 is a deficient number, since it is larger than the sum of its proper divisors (26966008).

28644272 is a wasteful number, since it uses less digits than its factorization.

28644272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620 (or 3614 counting only the distinct ones).

The product of its digits is 43008, while the sum is 35.

The square root of 28644272 is about 5352.0343795607. The cubic root of 28644272 is about 305.9702934409.

The spelling of 28644272 in words is "twenty-eight million, six hundred forty-four thousand, two hundred seventy-two".