866213880 has 128 divisors (see below), whose sum is σ = 3000775680. Its totient is φ = 195932160.

The previous prime is 866213861. The next prime is 866213891. The reversal of 866213880 is 88312668.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76165 + ... + 86795.

It is an arithmetic number, because the mean of its divisors is an integer number (23443560).

Almost surely, 2^866213880 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 866213880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1500387840).

866213880 is an abundant number, since it is smaller than the sum of its proper divisors (2134561800).

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

866213880 is a wasteful number, since it uses less digits than its factorization.

866213880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10749 (or 10745 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 866213880 is about 29431.5116839078. The cubic root of 866213880 is about 953.2534362870.

The spelling of 866213880 in words is "eight hundred sixty-six million, two hundred thirteen thousand, eight hundred eighty".