861879808 has 20 divisors (see below), whose sum is σ = 1722077280. Its totient is φ = 430939648.

The previous prime is 861879803. The next prime is 861879833. The reversal of 861879808 is 808978168.

861879808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861879803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 841168 + ... + 842191.

It is an arithmetic number, because the mean of its divisors is an integer number (86103864).

Almost surely, 2^861879808 is an apocalyptic number.

It is an amenable number.

861879808 is a deficient number, since it is larger than the sum of its proper divisors (860197472).

861879808 is an equidigital number, since it uses as much as digits as its factorization.

861879808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683377 (or 1683361 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 55.

The square root of 861879808 is about 29357.7895625675. The cubic root of 861879808 is about 951.6609201291.

The spelling of 861879808 in words is "eight hundred sixty-one million, eight hundred seventy-nine thousand, eight hundred eight".