28225664 has 16 divisors (see below), whose sum is σ = 56231070. Its totient is φ = 14112768.

The previous prime is 28225663. The next prime is 28225667. The reversal of 28225664 is 46652282.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 7795264 = 4520^2 + 2792^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (28225663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110129 + ... + 110384.

Almost surely, 2^28225664 is an apocalyptic number.

It is an amenable number.

28225664 is a deficient number, since it is larger than the sum of its proper divisors (28005406).

28225664 is an equidigital number, since it uses as much as digits as its factorization.

28225664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220527 (or 220515 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 28225664 is about 5312.7830748112. The cubic root of 28225664 is about 304.4724877919.

The spelling of 28225664 in words is "twenty-eight million, two hundred twenty-five thousand, six hundred sixty-four".