28680336646 has 32 divisors (see below), whose sum is σ = 47740896000. Its totient is φ = 12914141760.

The previous prime is 28680336617. The next prime is 28680336667. The reversal of 28680336646 is 64663308682.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28680336593 and 28680336602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100555 + ... + 259753.

It is an arithmetic number, because the mean of its divisors is an integer number (1491903000).

Almost surely, 2^28680336646 is an apocalyptic number.

28680336646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28680336646 is a deficient number, since it is larger than the sum of its proper divisors (19060559354).

28680336646 is a wasteful number, since it uses less digits than its factorization.

28680336646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159281 (or 159255 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 52.

The spelling of 28680336646 in words is "twenty-eight billion, six hundred eighty million, three hundred thirty-six thousand, six hundred forty-six".