866418872 has 64 divisors (see below), whose sum is σ = 1884319200. Its totient is φ = 369111040.

The previous prime is 866418863. The next prime is 866418913. The reversal of 866418872 is 278814668.

It is a self number, because there is not a number n which added to its sum of digits gives 866418872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401348 + ... + 403500.

Almost surely, 2^866418872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866418872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942159600).

866418872 is an abundant number, since it is smaller than the sum of its proper divisors (1017900328).

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

866418872 is a wasteful number, since it uses less digits than its factorization.

866418872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2452 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

The square root of 866418872 is about 29434.9940037364. The cubic root of 866418872 is about 953.3286270762.

The spelling of 866418872 in words is "eight hundred sixty-six million, four hundred eighteen thousand, eight hundred seventy-two".