28661568 has 56 divisors (see below), whose sum is σ = 81674208. Its totient is φ = 8818176.

The previous prime is 28661561. The next prime is 28661579. The reversal of 28661568 is 86516682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661561) 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, 3246 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (1458468).

Almost surely, 2^28661568 is an apocalyptic number.

It is an amenable number.

28661568 is an abundant number, since it is smaller than the sum of its proper divisors (53012640).

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

28661568 is a wasteful number, since it uses less digits than its factorization.

28661568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11511 (or 11501 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 28661568 is about 5353.6499698804. The cubic root of 28661568 is about 306.0318647666.

The spelling of 28661568 in words is "twenty-eight million, six hundred sixty-one thousand, five hundred sixty-eight".