28011568 has 40 divisors (see below), whose sum is σ = 58933728. Its totient is φ = 12820992.

The previous prime is 28011551. The next prime is 28011611. The reversal of 28011568 is 86511082.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28005 + ... + 28987.

Almost surely, 2^28011568 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 28011568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29466864).

28011568 is an abundant number, since it is smaller than the sum of its proper divisors (30922160).

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

28011568 is a wasteful number, since it uses less digits than its factorization.

28011568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 28011568 is about 5292.5955825096. The cubic root of 28011568 is about 303.7007095981.

The spelling of 28011568 in words is "twenty-eight million, eleven thousand, five hundred sixty-eight".