28997568 has 112 divisors (see below), whose sum is σ = 86624160. Its totient is φ = 9510912.

The previous prime is 28997561. The next prime is 28997581. The reversal of 28997568 is 86579982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28997561) 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, 167530 + ... + 167702.

It is an arithmetic number, because the mean of its divisors is an integer number (773430).

Almost surely, 2^28997568 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 28997568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43312080).

28997568 is an abundant number, since it is smaller than the sum of its proper divisors (57626592).

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

28997568 is a wasteful number, since it uses less digits than its factorization.

28997568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 275 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 28997568 is about 5384.9389968690. The cubic root of 28997568 is about 307.2230939670.

The spelling of 28997568 in words is "twenty-eight million, nine hundred ninety-seven thousand, five hundred sixty-eight".