646552 has 8 divisors (see below), whose sum is σ = 1212300. Its totient is φ = 323272.

The previous prime is 646549. The next prime is 646571. The reversal of 646552 is 255646.

646552 is nontrivially palindromic in base 9.

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 self number, because there is not a number n which added to its sum of digits gives 646552.

It is a congruent number.

It is an unprimeable number.

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, 40402 + ... + 40417.

2⁶⁴⁶⁵⁵² is an apocalyptic number.

It is an amenable number.

646552 is a deficient number, since it is larger than the sum of its proper divisors (565748).

646552 is a wasteful number, since it uses less digits than its factorization.

646552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80825 (or 80821 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 646552 is about 804.0845726663. The cubic root of 646552 is about 86.4704700563.

The spelling of 646552 in words is "six hundred forty-six thousand, five hundred fifty-two".