28668781551 has 8 divisors (see below), whose sum is σ = 38708903680. Its totient is φ = 18870590232.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781551 is 15518786682.

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

It is not a de Polignac number, because 28668781551 - 2⁹ = 28668781039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28668781491 and 28668781500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668781511) 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, 60482425 + ... + 60482898.

It is an arithmetic number, because the mean of its divisors is an integer number (4838612960).

Almost surely, 2^28668781551 is an apocalyptic number.

28668781551 is a deficient number, since it is larger than the sum of its proper divisors (10040122129).

28668781551 is a wasteful number, since it uses less digits than its factorization.

28668781551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120965405.

The product of its digits is 6451200, while the sum is 57.

The spelling of 28668781551 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred fifty-one".