816780 has 24 divisors (see below), whose sum is σ = 2287152. Its totient is φ = 217792.

The previous prime is 816779. The next prime is 816811. The reversal of 816780 is 87618.

816780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 6747 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (95298).

2⁸¹⁶⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

816780 is an abundant number, since it is smaller than the sum of its proper divisors (1470372).

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

816780 is a wasteful number, since it uses less digits than its factorization.

816780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13625 (or 13623 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 816780 is about 903.7588173844. The cubic root of 816780 is about 93.4763397290.

It can be divided in two parts, 816 and 780, that added together give a triangular number (1596 = T₅₆).

The spelling of 816780 in words is "eight hundred sixteen thousand, seven hundred eighty".