28549664 has 96 divisors (see below), whose sum is σ = 70108416. Its totient is φ = 11243520.

The previous prime is 28549663. The next prime is 28549679. The reversal of 28549664 is 46694582.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (28549663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77609 + ... + 77975.

It is an arithmetic number, because the mean of its divisors is an integer number (730296).

Almost surely, 2^28549664 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 28549664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35054208).

28549664 is an abundant number, since it is smaller than the sum of its proper divisors (41558752).

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

28549664 is a wasteful number, since it uses less digits than its factorization.

28549664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 410 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 28549664 is about 5343.1885611496. The cubic root of 28549664 is about 305.6330629506.

The spelling of 28549664 in words is "twenty-eight million, five hundred forty-nine thousand, six hundred sixty-four".