64061664 has 24 divisors (see below), whose sum is σ = 168162120. Its totient is φ = 21353856.

The previous prime is 64061629. The next prime is 64061707. The reversal of 64061664 is 46616046.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333559 + ... + 333750.

It is an arithmetic number, because the mean of its divisors is an integer number (7006755).

Almost surely, 2^64061664 is an apocalyptic number.

It is an amenable number.

64061664 is an abundant number, since it is smaller than the sum of its proper divisors (104100456).

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

64061664 is a wasteful number, since it uses less digits than its factorization.

64061664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667322 (or 667314 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 64061664 is about 8003.8530721147. The cubic root of 64061664 is about 400.1284254295.

The spelling of 64061664 in words is "sixty-four million, sixty-one thousand, six hundred sixty-four".