864980 has 24 divisors (see below), whose sum is σ = 1848840. Its totient is φ = 339840.

The previous prime is 864979. The next prime is 864989. The reversal of 864980 is 89468.

864980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 29584 + 835396 = 172^2 + 914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 864980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864989) 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, 866 + ... + 1574.

It is an arithmetic number, because the mean of its divisors is an integer number (77035).

2⁸⁶⁴⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

864980 is an abundant number, since it is smaller than the sum of its proper divisors (983860).

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

864980 is a wasteful number, since it uses less digits than its factorization.

864980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 864980 is about 930.0430097582. The cubic root of 864980 is about 95.2800599984.

The spelling of 864980 in words is "eight hundred sixty-four thousand, nine hundred eighty".