64666844 has 24 divisors (see below), whose sum is σ = 130718448. Its totient is φ = 27664640.

The previous prime is 64666829. The next prime is 64666853. The reversal of 64666844 is 44866646.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 64666795 and 64666804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42479 + ... + 43974.

It is an arithmetic number, because the mean of its divisors is an integer number (5446602).

Almost surely, 2^64666844 is an apocalyptic number.

It is an amenable number.

64666844 is an abundant number, since it is smaller than the sum of its proper divisors (66051604).

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

64666844 is a wasteful number, since it uses less digits than its factorization.

64666844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86485 (or 86483 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The square root of 64666844 is about 8041.5697472571. The cubic root of 64666844 is about 401.3844609744.

The spelling of 64666844 in words is "sixty-four million, six hundred sixty-six thousand, eight hundred forty-four".