864672 has 24 divisors (see below), whose sum is σ = 2270016. Its totient is φ = 288192.

The previous prime is 864641. The next prime is 864673. The reversal of 864672 is 276468.

It is a tau number, because it is divible by the number of its divisors (24).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (864673) by changing a digit.

864672 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4408 + ... + 4599.

It is an arithmetic number, because the mean of its divisors is an integer number (94584).

2⁸⁶⁴⁶⁷² is an apocalyptic number.

It is an amenable number.

864672 is an abundant number, since it is smaller than the sum of its proper divisors (1405344).

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

864672 is a wasteful number, since it uses less digits than its factorization.

864672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020 (or 9012 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 864672 is about 929.8774112753. The cubic root of 864672 is about 95.2687496242.

The spelling of 864672 in words is "eight hundred sixty-four thousand, six hundred seventy-two".