28601621868 has 24 divisors (see below), whose sum is σ = 67868256960. Its totient is φ = 9372282640.

The previous prime is 28601621827. The next prime is 28601621869. The reversal of 28601621868 is 86812610682.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28601621869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20198178 + ... + 20199593.

It is an arithmetic number, because the mean of its divisors is an integer number (2827844040).

Almost surely, 2^28601621868 is an apocalyptic number.

It is an amenable number.

28601621868 is an abundant number, since it is smaller than the sum of its proper divisors (39266635092).

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

28601621868 is a wasteful number, since it uses less digits than its factorization.

28601621868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40397837 (or 40397835 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 28601621868 in words is "twenty-eight billion, six hundred one million, six hundred twenty-one thousand, eight hundred sixty-eight".