281906821228 has 12 divisors (see below), whose sum is σ = 493341120720. Its totient is φ = 140952215312.

The previous prime is 281906821193. The next prime is 281906821243. The reversal of 281906821228 is 822128609182.

It is a super-3 number, since 3×281906821228³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428550 + ... + 864562.

It is an arithmetic number, because the mean of its divisors is an integer number (41111760060).

Almost surely, 2^281906821228 is an apocalyptic number.

It is an amenable number.

281906821228 is a deficient number, since it is larger than the sum of its proper divisors (211434299492).

281906821228 is a wasteful number, since it uses less digits than its factorization.

281906821228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597656 (or 597654 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The spelling of 281906821228 in words is "two hundred eighty-one billion, nine hundred six million, eight hundred twenty-one thousand, two hundred twenty-eight".