866363904 has 240 divisors, whose sum is σ = 2985523200. Its totient is φ = 247339008.

The previous prime is 866363891. The next prime is 866363929. The reversal of 866363904 is 409363668.

866363904 is a `hidden beast` number, since 8 + 6 + 6 + 3 + 639 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 866363904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 676737 + ... + 678015.

It is an arithmetic number, because the mean of its divisors is an integer number (12439680).

Almost surely, 2^866363904 is an apocalyptic number.

866363904 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866363904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492761600).

866363904 is an abundant number, since it is smaller than the sum of its proper divisors (2119159296).

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

866363904 is a wasteful number, since it uses less digits than its factorization.

866363904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 866363904 is about 29434.0602703738. The cubic root of 866363904 is about 953.3084660517.

The spelling of 866363904 in words is "eight hundred sixty-six million, three hundred sixty-three thousand, nine hundred four".