281868836 has 6 divisors (see below), whose sum is σ = 493270470. Its totient is φ = 140934416.

The previous prime is 281868817. The next prime is 281868859. The reversal of 281868836 is 638868182.

It can be written as a sum of positive squares in only one way, i.e., 271590400 + 10278436 = 16480^2 + 3206^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35233601 + ... + 35233608.

It is an arithmetic number, because the mean of its divisors is an integer number (82211745).

Almost surely, 2^281868836 is an apocalyptic number.

It is an amenable number.

281868836 is a deficient number, since it is larger than the sum of its proper divisors (211401634).

281868836 is a wasteful number, since it uses less digits than its factorization.

281868836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70467213 (or 70467211 counting only the distinct ones).

The product of its digits is 884736, while the sum is 50.

The square root of 281868836 is about 16788.9498182584. The cubic root of 281868836 is about 655.6655325763.

The spelling of 281868836 in words is "two hundred eighty-one million, eight hundred sixty-eight thousand, eight hundred thirty-six".