861424866 has 12 divisors (see below), whose sum is σ = 1866420582. Its totient is φ = 287141616.

The previous prime is 861424853. The next prime is 861424873. The reversal of 861424866 is 668424168.

861424866 is a `hidden beast` number, since 8 + 614 + 24 + 8 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 631265625 + 230159241 = 25125^2 + 15171^2 .

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, 23928451 + ... + 23928486.

Almost surely, 2^861424866 is an apocalyptic number.

861424866 is an abundant number, since it is smaller than the sum of its proper divisors (1004995716).

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

861424866 is a wasteful number, since it uses less digits than its factorization.

861424866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47856945 (or 47856942 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 861424866 is about 29350.0403066163. The cubic root of 861424866 is about 951.4934463823.

The spelling of 861424866 in words is "eight hundred sixty-one million, four hundred twenty-four thousand, eight hundred sixty-six".