28897664 has 32 divisors (see below), whose sum is σ = 57815640. Its totient is φ = 14387200.

The previous prime is 28897663. The next prime is 28897679. The reversal of 28897664 is 46679882.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28897663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51047 + ... + 51609.

Almost surely, 2^28897664 is an apocalyptic number.

It is an amenable number.

28897664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28897664 is an equidigital number, since it uses as much as digits as its factorization.

28897664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 966 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 28897664 is about 5375.6547508187. The cubic root of 28897664 is about 306.8698674276.

The spelling of 28897664 in words is "twenty-eight million, eight hundred ninety-seven thousand, six hundred sixty-four".