646754 has 4 divisors (see below), whose sum is σ = 970134. Its totient is φ = 323376.

The previous prime is 646721. The next prime is 646757. The reversal of 646754 is 457646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 76729 = 755^2 + 277^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646754.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646754.

It is not an unprimeable number, because it can be changed into a prime (646757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161687 + ... + 161690.

2⁶⁴⁶⁷⁵⁴ is an apocalyptic number.

646754 is a deficient number, since it is larger than the sum of its proper divisors (323380).

646754 is a wasteful number, since it uses less digits than its factorization.

646754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323379.

The product of its digits is 20160, while the sum is 32.

The square root of 646754 is about 804.2101715348. The cubic root of 646754 is about 86.4794743417.

The spelling of 646754 in words is "six hundred forty-six thousand, seven hundred fifty-four".