64660 has 24 divisors (see below), whose sum is σ = 140616. Its totient is φ = 24960.

The previous prime is 64633. The next prime is 64661. The reversal of 64660 is 6646.

It can be written as a sum of positive squares in 4 ways, for example, as 1156 + 63504 = 34^2 + 252^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661) by changing a digit.

64660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030 + ... + 1090.

It is an arithmetic number, because the mean of its divisors is an integer number (5859).

2⁶⁴⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

64660 is an abundant number, since it is smaller than the sum of its proper divisors (75956).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70308).

64660 is a wasteful number, since it uses less digits than its factorization.

64660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 64660 is about 254.2833065697. The cubic root of 64660 is about 40.1370300332.

The spelling of 64660 in words is "sixty-four thousand, six hundred sixty".