646734 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 190400.

The previous prime is 646721. The next prime is 646757. The reversal of 646734 is 437646.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

646734 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 15 ways as a sum of consecutive naturals, for example, 2587 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶⁴⁶⁷³⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

646734 is an abundant number, since it is smaller than the sum of its proper divisors (804786).

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

646734 is a wasteful number, since it uses less digits than its factorization.

646734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 12096, while the sum is 30.

The square root of 646734 is about 804.1977368782. The cubic root of 646734 is about 86.4785829120.

The spelling of 646734 in words is "six hundred forty-six thousand, seven hundred thirty-four".