861835868 has 12 divisors (see below), whose sum is σ = 1508898552. Its totient is φ = 430722000.

The previous prime is 861835837. The next prime is 861835889. The reversal of 861835868 is 868538168.

It is a super-2 number, since 2×861835868² = 1485522126742626848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38855 + ... + 56862.

It is an arithmetic number, because the mean of its divisors is an integer number (125741546).

Almost surely, 2^861835868 is an apocalyptic number.

It is an amenable number.

861835868 is a deficient number, since it is larger than the sum of its proper divisors (647062684).

861835868 is a wasteful number, since it uses less digits than its factorization.

861835868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97972 (or 97970 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The square root of 861835868 is about 29357.0411996850. The cubic root of 861835868 is about 951.6447474597.

The spelling of 861835868 in words is "eight hundred sixty-one million, eight hundred thirty-five thousand, eight hundred sixty-eight".