646722 has 48 divisors (see below), whose sum is σ = 1547520. Its totient is φ = 194400.

The previous prime is 646721. The next prime is 646757. The reversal of 646722 is 227646.

646722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (646721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10572 + ... + 10632.

It is an arithmetic number, because the mean of its divisors is an integer number (32240).

2⁶⁴⁶⁷²² is an apocalyptic number.

646722 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 646722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773760).

646722 is an abundant number, since it is smaller than the sum of its proper divisors (900798).

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

646722 is a wasteful number, since it uses less digits than its factorization.

646722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 116 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 646722 is about 804.1902759919. The cubic root of 646722 is about 86.4780480453.

It can be divided in two parts, 64 and 6722, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 646722 in words is "six hundred forty-six thousand, seven hundred twenty-two".