28861592769 has 9 divisors (see below), whose sum is σ = 41689703523. Its totient is φ = 19240722072.

The previous prime is 28861592741. The next prime is 28861592779. The reversal of 28861592769 is 96729516882.

The square root of 28861592769 is 169887.

It is a perfect power (a square), and thus also a powerful number.

28861592769 is a `hidden beast` number, since 2 + 8 + 8 + 615 + 9 + 2 + 7 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11548296369 + 17313296400 = 107463^2 + 131580^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-28861592769 is a prime.

It is a super-2 number, since 2×28861592769² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28861592779) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 481347 + ... + 537975.

Almost surely, 2^28861592769 is an apocalyptic number.

28861592769 is the 169887-th square number.

28861592769 is the 84944-th centered octagonal number.

It is an amenable number.

28861592769 is a deficient number, since it is larger than the sum of its proper divisors (12828110754).

28861592769 is an frugal number, since it uses more digits than its factorization.

28861592769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113264 (or 56632 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 28861592769 in words is "twenty-eight billion, eight hundred sixty-one million, five hundred ninety-two thousand, seven hundred sixty-nine".