866181880 has 32 divisors (see below), whose sum is σ = 2051485200. Its totient is φ = 328237056.

The previous prime is 866181751. The next prime is 866181913. The reversal of 866181880 is 88181668.

866181880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 866181880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569097 + ... + 570616.

Almost surely, 2^866181880 is an apocalyptic number.

It is an amenable number.

866181880 is an abundant number, since it is smaller than the sum of its proper divisors (1185303320).

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

866181880 is a wasteful number, since it uses less digits than its factorization.

866181880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139743 (or 1139739 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 46.

The square root of 866181880 is about 29430.9680438819. The cubic root of 866181880 is about 953.2416976597.

The spelling of 866181880 in words is "eight hundred sixty-six million, one hundred eighty-one thousand, eight hundred eighty".