646772 has 12 divisors (see below), whose sum is σ = 1293600. Its totient is φ = 277176.

The previous prime is 646771. The next prime is 646781. The reversal of 646772 is 277646.

It is a happy number.

646772 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646771) 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, 11522 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (107800).

2⁶⁴⁶⁷⁷² is an apocalyptic number.

It is an amenable number.

646772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646772 is a wasteful number, since it uses less digits than its factorization.

646772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23110 (or 23108 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 646772 is about 804.2213625613. The cubic root of 646772 is about 86.4802766128.

The spelling of 646772 in words is "six hundred forty-six thousand, seven hundred seventy-two".