840666862 has 32 divisors (see below), whose sum is σ = 1489664448. Its totient is φ = 348281856.

The previous prime is 840666851. The next prime is 840666901. The reversal of 840666862 is 268666048.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76158 + ... + 86494.

It is an arithmetic number, because the mean of its divisors is an integer number (46552014).

Almost surely, 2^840666862 is an apocalyptic number.

840666862 is a deficient number, since it is larger than the sum of its proper divisors (648997586).

840666862 is a wasteful number, since it uses less digits than its factorization.

840666862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10540.

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 840666862 is about 28994.2556724604. The cubic root of 840666862 is about 943.7884165933.

The spelling of 840666862 in words is "eight hundred forty million, six hundred sixty-six thousand, eight hundred sixty-two".