864508 has 6 divisors (see below), whose sum is σ = 1512896. Its totient is φ = 432252.

The previous prime is 864503. The next prime is 864509. The reversal of 864508 is 805468.

It is a self number, because there is not a number n which added to its sum of digits gives 864508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108060 + ... + 108067.

2⁸⁶⁴⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

864508 is a deficient number, since it is larger than the sum of its proper divisors (648388).

864508 is a wasteful number, since it uses less digits than its factorization.

864508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216131 (or 216129 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 864508 is about 929.7892234265. The cubic root of 864508 is about 95.2627261214.

It can be divided in two parts, 8 and 64508, that added together give a square (64516 = 254²).

The spelling of 864508 in words is "eight hundred sixty-four thousand, five hundred eight".