28610861568 has 80 divisors (see below), whose sum is σ = 76389783360. Its totient is φ = 9515851776.

The previous prime is 28610861567. The next prime is 28610861579. The reversal of 28610861568 is 86516801682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28610861568.

It is not an unprimeable number, because it can be changed into a prime (28610861567) 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, 681573 + ... + 722331.

It is an arithmetic number, because the mean of its divisors is an integer number (954872292).

Almost surely, 2^28610861568 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 28610861568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38194891680).

28610861568 is an abundant number, since it is smaller than the sum of its proper divisors (47778921792).

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

28610861568 is an equidigital number, since it uses as much as digits as its factorization.

28610861568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41237 (or 41221 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 28610861568 in words is "twenty-eight billion, six hundred ten million, eight hundred sixty-one thousand, five hundred sixty-eight".