780820 has 12 divisors (see below), whose sum is σ = 1639764. Its totient is φ = 312320.

The previous prime is 780817. The next prime is 780823. The reversal of 780820 is 28087.

780820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (780817) and next prime (780823).

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 242064 = 734^2 + 492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19501 + ... + 19540.

It is an arithmetic number, because the mean of its divisors is an integer number (136647).

2⁷⁸⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

780820 is an abundant number, since it is smaller than the sum of its proper divisors (858944).

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

780820 is a wasteful number, since it uses less digits than its factorization.

780820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39050 (or 39048 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 780820 is about 883.6401982708. The cubic root of 780820 is about 92.0838869405.

It can be divided in two parts, 780 and 820, that added together give a square (1600 = 40²).

The spelling of 780820 in words is "seven hundred eighty thousand, eight hundred twenty".