646264 has 8 divisors (see below), whose sum is σ = 1211760. Its totient is φ = 323128.

The previous prime is 646259. The next prime is 646267. The reversal of 646264 is 462646.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) 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 (646267) 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, 40384 + ... + 40399.

It is an arithmetic number, because the mean of its divisors is an integer number (151470).

2⁶⁴⁶²⁶⁴ is an apocalyptic number.

It is an amenable number.

646264 is a deficient number, since it is larger than the sum of its proper divisors (565496).

646264 is a wasteful number, since it uses less digits than its factorization.

646264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80789 (or 80785 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 646264 is about 803.9054670793. The cubic root of 646264 is about 86.4576290196.

It can be divided in two parts, 64 and 6264, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 646264 in words is "six hundred forty-six thousand, two hundred sixty-four".