28145568 has 72 divisors (see below), whose sum is σ = 81242784. Its totient is φ = 8525440.

The previous prime is 28145563. The next prime is 28145581. The reversal of 28145568 is 86554182.

It is not an unprimeable number, because it can be changed into a prime (28145563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10405 + ... + 12827.

It is an arithmetic number, because the mean of its divisors is an integer number (1128372).

Almost surely, 2^28145568 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 28145568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40621392).

28145568 is an abundant number, since it is smaller than the sum of its proper divisors (53097216).

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

28145568 is a wasteful number, since it uses less digits than its factorization.

28145568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458 (or 2439 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 28145568 is about 5305.2396741335. The cubic root of 28145568 is about 304.1842142959.

The spelling of 28145568 in words is "twenty-eight million, one hundred forty-five thousand, five hundred sixty-eight".