28013568 has 88 divisors (see below), whose sum is σ = 81552480. Its totient is φ = 8478720.

The previous prime is 28013567. The next prime is 28013591. The reversal of 28013568 is 86531082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (88).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28013561) 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, 33378 + ... + 34206.

Almost surely, 2^28013568 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 28013568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40776240).

28013568 is an abundant number, since it is smaller than the sum of its proper divisors (53538912).

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

28013568 is a wasteful number, since it uses less digits than its factorization.

28013568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28013568 is about 5292.7845223474. The cubic root of 28013568 is about 303.7079374091.

The spelling of 28013568 in words is "twenty-eight million, thirteen thousand, five hundred sixty-eight".