28776658969 has 4 divisors (see below), whose sum is σ = 28777100800. Its totient is φ = 28776217140.

The previous prime is 28776658957. The next prime is 28776659003. The reversal of 28776658969 is 96985667782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28776658969 is a prime.

It is a super-2 number, since 2×28776658969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28776656969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101817 + ... + 260614.

It is an arithmetic number, because the mean of its divisors is an integer number (7194275200).

Almost surely, 2^28776658969 is an apocalyptic number.

It is an amenable number.

28776658969 is a deficient number, since it is larger than the sum of its proper divisors (441831).

28776658969 is an equidigital number, since it uses as much as digits as its factorization.

28776658969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441830.

The product of its digits is 548674560, while the sum is 73.

The spelling of 28776658969 in words is "twenty-eight billion, seven hundred seventy-six million, six hundred fifty-eight thousand, nine hundred sixty-nine".