28153664 has 112 divisors (see below), whose sum is σ = 72420480. Its totient is φ = 10536960.

The previous prime is 28153663. The next prime is 28153703. The reversal of 28153664 is 46635182.

It is a tau number, because it is divible by the number of its divisors (112).

Its product of digits (34560) is a multiple of the sum of its prime factors (256).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28153661) 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, 142814 + ... + 143010.

Almost surely, 2^28153664 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 28153664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36210240).

28153664 is an abundant number, since it is smaller than the sum of its proper divisors (44266816).

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

28153664 is a wasteful number, since it uses less digits than its factorization.

28153664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 246 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 28153664 is about 5306.0026385218. The cubic root of 28153664 is about 304.2133774346.

The spelling of 28153664 in words is "twenty-eight million, one hundred fifty-three thousand, six hundred sixty-four".