866780 has 24 divisors (see below), whose sum is σ = 1916880. Its totient is φ = 328320.

The previous prime is 866777. The next prime is 866783. The reversal of 866780 is 87668.

It is an interprime number because it is at equal distance from previous prime (866777) and next prime (866783).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 866780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (79870).

2⁸⁶⁶⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

866780 is an abundant number, since it is smaller than the sum of its proper divisors (1050100).

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

866780 is a wasteful number, since it uses less digits than its factorization.

866780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 866780 is about 931.0102040257. The cubic root of 866780 is about 95.3461059495.

The spelling of 866780 in words is "eight hundred sixty-six thousand, seven hundred eighty".