64335681 has 8 divisors (see below), whose sum is σ = 95312160. Its totient is φ = 42890436.

The previous prime is 64335679. The next prime is 64335709. The reversal of 64335681 is 18653346.

64335681 is a `hidden beast` number, since 64 + 33 + 568 + 1 = 666.

It is not a de Polignac number, because 64335681 - 2¹ = 64335679 is a prime.

It is a super-2 number, since 2×64335681² = 8278159699467522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64335641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191375 + ... + 1191428.

It is an arithmetic number, because the mean of its divisors is an integer number (11914020).

Almost surely, 2^64335681 is an apocalyptic number.

It is an amenable number.

64335681 is a deficient number, since it is larger than the sum of its proper divisors (30976479).

64335681 is a wasteful number, since it uses less digits than its factorization.

64335681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382812 (or 2382806 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64335681 is about 8020.9526242211. The cubic root of 64335681 is about 400.6981162919.

The spelling of 64335681 in words is "sixty-four million, three hundred thirty-five thousand, six hundred eighty-one".