64646 has 4 divisors (see below), whose sum is σ = 96972. Its totient is φ = 32322.

The previous prime is 64633. The next prime is 64661.

64646 is nontrivially palindromic in base 10.

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

64646 is an undulating number in base 10.

It is a Curzon number.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16160 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (24243).

2⁶⁴⁶⁴⁶ is an apocalyptic number.

64646 is a deficient number, since it is larger than the sum of its proper divisors (32326).

64646 is a wasteful number, since it uses less digits than its factorization.

64646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32325.

The product of its digits is 3456, while the sum is 26.

The square root of 64646 is about 254.2557767289. The cubic root of 64646 is about 40.1341330388.

Subtracting from 64646 its sum of digits (26), we obtain a triangular number (64620 = T₃₅₉).

The spelling of 64646 in words is "sixty-four thousand, six hundred forty-six".