868661982 has 20 divisors (see below), whose sum is σ = 1946446656. Its totient is φ = 289553940.

The previous prime is 868661977. The next prime is 868662019. The reversal of 868661982 is 289166868.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2680894 + ... + 2681217.

Almost surely, 2^868661982 is an apocalyptic number.

868661982 is an abundant number, since it is smaller than the sum of its proper divisors (1077784674).

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

868661982 is a wasteful number, since it uses less digits than its factorization.

868661982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362125 (or 5362116 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 868661982 is about 29473.0721506938. The cubic root of 868661982 is about 954.1506229483.

The spelling of 868661982 in words is "eight hundred sixty-eight million, six hundred sixty-one thousand, nine hundred eighty-two".