64718661 has 48 divisors (see below), whose sum is σ = 105146304. Its totient is φ = 35271936.

The previous prime is 64718659. The next prime is 64718683. The reversal of 64718661 is 16681746.

It is a happy number.

It is not a de Polignac number, because 64718661 - 2¹ = 64718659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64718651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 396966 + ... + 397128.

It is an arithmetic number, because the mean of its divisors is an integer number (2190548).

Almost surely, 2^64718661 is an apocalyptic number.

It is an amenable number.

64718661 is a deficient number, since it is larger than the sum of its proper divisors (40427643).

64718661 is a wasteful number, since it uses less digits than its factorization.

64718661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 283 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 64718661 is about 8044.7909233242. The cubic root of 64718661 is about 401.4916410200.

The spelling of 64718661 in words is "sixty-four million, seven hundred eighteen thousand, six hundred sixty-one".