861178806 has 12 divisors (see below), whose sum is σ = 1865887452. Its totient is φ = 287059596.

The previous prime is 861178793. The next prime is 861178817. The reversal of 861178806 is 608871168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23921616 + ... + 23921651.

It is an arithmetic number, because the mean of its divisors is an integer number (155490621).

Almost surely, 2^861178806 is an apocalyptic number.

861178806 is an abundant number, since it is smaller than the sum of its proper divisors (1004708646).

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

861178806 is a wasteful number, since it uses less digits than its factorization.

861178806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47843275 (or 47843272 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 861178806 is about 29345.8481901614. The cubic root of 861178806 is about 951.4028419345.

The spelling of 861178806 in words is "eight hundred sixty-one million, one hundred seventy-eight thousand, eight hundred six".