864234820 has 12 divisors (see below), whose sum is σ = 1814893164. Its totient is φ = 345693920.

The previous prime is 864234803. The next prime is 864234883. The reversal of 864234820 is 28432468.

It can be written as a sum of positive squares in 2 ways, for example, as 193321216 + 670913604 = 13904^2 + 25902^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 864234820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21605851 + ... + 21605890.

It is an arithmetic number, because the mean of its divisors is an integer number (151241097).

Almost surely, 2^864234820 is an apocalyptic number.

It is an amenable number.

864234820 is an abundant number, since it is smaller than the sum of its proper divisors (950658344).

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

864234820 is a wasteful number, since it uses less digits than its factorization.

864234820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43211750 (or 43211748 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 864234820 is about 29397.8710113505. The cubic root of 864234820 is about 952.5269089010.

The spelling of 864234820 in words is "eight hundred sixty-four million, two hundred thirty-four thousand, eight hundred twenty".