28285664 has 48 divisors (see below), whose sum is σ = 61399296. Its totient is φ = 12720000.

The previous prime is 28285657. The next prime is 28285667. The reversal of 28285664 is 46658282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285667) 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, 37289 + ... + 38039.

It is an arithmetic number, because the mean of its divisors is an integer number (1279152).

Almost surely, 2^28285664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28285664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30699648).

28285664 is an abundant number, since it is smaller than the sum of its proper divisors (33113632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28285664 is a wasteful number, since it uses less digits than its factorization.

28285664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 871 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 28285664 is about 5318.4268350707. The cubic root of 28285664 is about 304.6880766976.

The spelling of 28285664 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred sixty-four".