28809000661 has 12 divisors (see below), whose sum is σ = 33542416992. Its totient is φ = 24671393208.

The previous prime is 28809000659. The next prime is 28809000721. The reversal of 28809000661 is 16600090882.

It is not a de Polignac number, because 28809000661 - 2¹ = 28809000659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28809000361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206745 + ... + 316798.

It is an arithmetic number, because the mean of its divisors is an integer number (2795201416).

Almost surely, 2^28809000661 is an apocalyptic number.

It is an amenable number.

28809000661 is a deficient number, since it is larger than the sum of its proper divisors (4733416331).

28809000661 is a wasteful number, since it uses less digits than its factorization.

28809000661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524680 (or 524673 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 28809000661 in words is "twenty-eight billion, eight hundred nine million, six hundred sixty-one", and thus it is an aban number.