28244657 has 8 divisors (see below), whose sum is σ = 32827200. Its totient is φ = 23799024.

The previous prime is 28244641. The next prime is 28244669. The reversal of 28244657 is 75644282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28244657 - 2⁴ = 28244641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28244657.

It is not an unprimeable number, because it can be changed into a prime (28244257) 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, 33782 + ... + 34607.

It is an arithmetic number, because the mean of its divisors is an integer number (4103400).

Almost surely, 2^28244657 is an apocalyptic number.

It is an amenable number.

28244657 is a deficient number, since it is larger than the sum of its proper divisors (4582543).

28244657 is an equidigital number, since it uses as much as digits as its factorization.

28244657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68455.

The product of its digits is 107520, while the sum is 38.

The square root of 28244657 is about 5314.5702554393. The cubic root of 28244657 is about 304.5407654813.

The spelling of 28244657 in words is "twenty-eight million, two hundred forty-four thousand, six hundred fifty-seven".