28317881812 has 24 divisors (see below), whose sum is σ = 54539839872. Its totient is φ = 12757852800.

The previous prime is 28317881777. The next prime is 28317881833. The reversal of 28317881812 is 21818871382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2842764 + ... + 2852707.

It is an arithmetic number, because the mean of its divisors is an integer number (2272493328).

Almost surely, 2^28317881812 is an apocalyptic number.

28317881812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28317881812 is a deficient number, since it is larger than the sum of its proper divisors (26221958060).

28317881812 is a wasteful number, since it uses less digits than its factorization.

28317881812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695599 (or 5695597 counting only the distinct ones).

The product of its digits is 344064, while the sum is 49.

The spelling of 28317881812 in words is "twenty-eight billion, three hundred seventeen million, eight hundred eighty-one thousand, eight hundred twelve".