786820 has 12 divisors (see below), whose sum is σ = 1652364. Its totient is φ = 314720.

The previous prime is 786803. The next prime is 786823. The reversal of 786820 is 28687.

It can be written as a sum of positive squares in 2 ways, for example, as 133956 + 652864 = 366^2 + 808^2 .

It is not an unprimeable number, because it can be changed into a prime (786823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19651 + ... + 19690.

It is an arithmetic number, because the mean of its divisors is an integer number (137697).

2⁷⁸⁶⁸²⁰ is an apocalyptic number.

It is an amenable number.

786820 is an abundant number, since it is smaller than the sum of its proper divisors (865544).

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

786820 is a wasteful number, since it uses less digits than its factorization.

786820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39350 (or 39348 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 786820 is about 887.0287481249. The cubic root of 786820 is about 92.3191499310.

The spelling of 786820 in words is "seven hundred eighty-six thousand, eight hundred twenty".