866003886 has 128 divisors (see below), whose sum is σ = 2182118400. Its totient is φ = 255441600.

The previous prime is 866003867. The next prime is 866003893. The reversal of 866003886 is 688300668.

866003886 is a `hidden beast` number, since 8 + 6 + 600 + 38 + 8 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1972455 + ... + 1972893.

It is an arithmetic number, because the mean of its divisors is an integer number (17047800).

Almost surely, 2^866003886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866003886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091059200).

866003886 is an abundant number, since it is smaller than the sum of its proper divisors (1316114514).

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

866003886 is a wasteful number, since it uses less digits than its factorization.

866003886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 866003886 is about 29427.9439648780. The cubic root of 866003886 is about 953.1763984695.

The spelling of 866003886 in words is "eight hundred sixty-six million, three thousand, eight hundred eighty-six".