28221344 has 12 divisors (see below), whose sum is σ = 55560834. Its totient is φ = 14110656.

The previous prime is 28221337. The next prime is 28221353. The reversal of 28221344 is 44312282.

It can be written as a sum of positive squares in only one way, i.e., 14531344 + 13690000 = 3812^2 + 3700^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440927 + ... + 440990.

Almost surely, 2^28221344 is an apocalyptic number.

It is an amenable number.

28221344 is a deficient number, since it is larger than the sum of its proper divisors (27339490).

28221344 is an equidigital number, since it uses as much as digits as its factorization.

28221344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881927 (or 881919 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 28221344 is about 5312.3764926820. The cubic root of 28221344 is about 304.4569536046.

The spelling of 28221344 in words is "twenty-eight million, two hundred twenty-one thousand, three hundred forty-four".