28689662009 has 8 divisors (see below), whose sum is σ = 31976094240. Its totient is φ = 25580874816.

The previous prime is 28689661969. The next prime is 28689662021. The reversal of 28689662009 is 90026698682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28689662009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28619662009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44410919 + ... + 44411564.

It is an arithmetic number, because the mean of its divisors is an integer number (3997011780).

Almost surely, 2^28689662009 is an apocalyptic number.

It is an amenable number.

28689662009 is a deficient number, since it is larger than the sum of its proper divisors (3286432231).

28689662009 is a wasteful number, since it uses less digits than its factorization.

28689662009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88822519.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 28689662009 in words is "twenty-eight billion, six hundred eighty-nine million, six hundred sixty-two thousand, nine".