786805866 has 128 divisors (see below), whose sum is σ = 2308331520. Its totient is φ = 192326400.

The previous prime is 786805861. The next prime is 786805871. The reversal of 786805866 is 668508687.

It is an interprime number because it is at equal distance from previous prime (786805861) and next prime (786805871).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (786805861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65121 + ... + 76251.

It is an arithmetic number, because the mean of its divisors is an integer number (18033840).

Almost surely, 2^786805866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 786805866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154165760).

786805866 is an abundant number, since it is smaller than the sum of its proper divisors (1521525654).

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

786805866 is a wasteful number, since it uses less digits than its factorization.

786805866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11177 (or 11171 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The square root of 786805866 is about 28050.0599999358. The cubic root of 786805866 is about 923.1859713766.

The spelling of 786805866 in words is "seven hundred eighty-six million, eight hundred five thousand, eight hundred sixty-six".