840879864 has 48 divisors (see below), whose sum is σ = 2484420120. Its totient is φ = 254811840.

The previous prime is 840879863. The next prime is 840879883. The reversal of 840879864 is 468978048.

It is a self number, because there is not a number n which added to its sum of digits gives 840879864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840879863) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 530067 + ... + 531650.

Almost surely, 2^840879864 is an apocalyptic number.

It is an amenable number.

840879864 is an abundant number, since it is smaller than the sum of its proper divisors (1643540256).

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

840879864 is a wasteful number, since it uses less digits than its factorization.

840879864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061740 (or 1061733 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 840879864 is about 28997.9286156787. The cubic root of 840879864 is about 943.8681199230.

The spelling of 840879864 in words is "eight hundred forty million, eight hundred seventy-nine thousand, eight hundred sixty-four".