28668781550 has 24 divisors (see below), whose sum is σ = 54564029256. Its totient is φ = 11200825440.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781550 is 5518786682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6665009 + ... + 6669308.

It is an arithmetic number, because the mean of its divisors is an integer number (2273501219).

Almost surely, 2^28668781550 is an apocalyptic number.

28668781550 is a deficient number, since it is larger than the sum of its proper divisors (25895247706).

28668781550 is a wasteful number, since it uses less digits than its factorization.

28668781550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13334372 (or 13334367 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 56.

The spelling of 28668781550 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred fifty".