864784 has 10 divisors (see below), whose sum is σ = 1675550. Its totient is φ = 432384.

The previous prime is 864781. The next prime is 864793. The reversal of 864784 is 487468.

It can be written as a sum of positive squares in only one way, i.e., 861184 + 3600 = 928^2 + 60^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27009 + ... + 27040.

It is an arithmetic number, because the mean of its divisors is an integer number (167555).

2⁸⁶⁴⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

864784 is a deficient number, since it is larger than the sum of its proper divisors (810766).

864784 is a wasteful number, since it uses less digits than its factorization.

864784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54057 (or 54051 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 864784 is about 929.9376323174. The cubic root of 864784 is about 95.2728627983.

The spelling of 864784 in words is "eight hundred sixty-four thousand, seven hundred eighty-four".