281381643368 has 64 divisors (see below), whose sum is σ = 606898984320. Its totient is φ = 119806156800.

The previous prime is 281381643359. The next prime is 281381643371. The reversal of 281381643368 is 863346183182.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8207783 + ... + 8241993.

It is an arithmetic number, because the mean of its divisors is an integer number (9482796630).

Almost surely, 2^281381643368 is an apocalyptic number.

281381643368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

281381643368 is an abundant number, since it is smaller than the sum of its proper divisors (325517340952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

281381643368 is a wasteful number, since it uses less digits than its factorization.

281381643368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35178 (or 35174 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 53.

The spelling of 281381643368 in words is "two hundred eighty-one billion, three hundred eighty-one million, six hundred forty-three thousand, three hundred sixty-eight".