866308856 has 32 divisors (see below), whose sum is σ = 1858124640. Its totient is φ = 370925568.

The previous prime is 866308853. The next prime is 866308873. The reversal of 866308856 is 658803668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866308853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57860 + ... + 71276.

It is an arithmetic number, because the mean of its divisors is an integer number (58066395).

Almost surely, 2^866308856 is an apocalyptic number.

It is an amenable number.

866308856 is an abundant number, since it is smaller than the sum of its proper divisors (991815784).

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

866308856 is a wasteful number, since it uses less digits than its factorization.

866308856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14583 (or 14579 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 866308856 is about 29433.1251483766. The cubic root of 866308856 is about 953.2882748304.

The spelling of 866308856 in words is "eight hundred sixty-six million, three hundred eight thousand, eight hundred fifty-six".