28690600689 has 27 divisors (see below), whose sum is σ = 41857862137. Its totient is φ = 18937019400.

The previous prime is 28690600669. The next prime is 28690600751. The reversal of 28690600689 is 98600609682.

The square root of 28690600689 is 169383.

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

28690600689 is a `hidden beast` number, since 28 + 6 + 9 + 0 + 600 + 6 + 8 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28690600689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28690600619) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 66567304 + ... + 66567734.

Almost surely, 2^28690600689 is an apocalyptic number.

28690600689 is the 169383-rd square number.

28690600689 is the 84692-nd centered octagonal number.

It is an amenable number.

28690600689 is a deficient number, since it is larger than the sum of its proper divisors (13167261448).

28690600689 is an frugal number, since it uses more digits than its factorization.

28690600689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 28690600689 in words is "twenty-eight billion, six hundred ninety million, six hundred thousand, six hundred eighty-nine".