864624 has 20 divisors (see below), whose sum is σ = 2233736. Its totient is φ = 288192.

The previous prime is 864623. The next prime is 864629. The reversal of 864624 is 426468.

It is a super-2 number, since 2×864624² = 1495149322752, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 864591 and 864600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864623) 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, 8959 + ... + 9054.

2⁸⁶⁴⁶²⁴ is an apocalyptic number.

It is an amenable number.

864624 is an abundant number, since it is smaller than the sum of its proper divisors (1369112).

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

864624 is a wasteful number, since it uses less digits than its factorization.

864624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18024 (or 18018 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 864624 is about 929.8516010633. The cubic root of 864624 is about 95.2669867266.

The spelling of 864624 in words is "eight hundred sixty-four thousand, six hundred twenty-four".