28653911669 has 4 divisors (see below), whose sum is σ = 28921705344. Its totient is φ = 28386117996.

The previous prime is 28653911653. The next prime is 28653911707. The reversal of 28653911669 is 96611935682.

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 not a de Polignac number, because 28653911669 - 2⁴ = 28653911653 is a prime.

It is a super-2 number, since 2×28653911669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28653911639) 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, 133896677 + ... + 133896890.

It is an arithmetic number, because the mean of its divisors is an integer number (7230426336).

Almost surely, 2^28653911669 is an apocalyptic number.

It is an amenable number.

28653911669 is a deficient number, since it is larger than the sum of its proper divisors (267793675).

28653911669 is a wasteful number, since it uses less digits than its factorization.

28653911669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267793674.

The product of its digits is 4199040, while the sum is 56.

The spelling of 28653911669 in words is "twenty-eight billion, six hundred fifty-three million, nine hundred eleven thousand, six hundred sixty-nine".