64768861 has 16 divisors (see below), whose sum is σ = 71884800. Its totient is φ = 58076928.

The previous prime is 64768849. The next prime is 64768871. The reversal of 64768861 is 16886746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64768861 - 2⁷ = 64768733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64768871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38116 + ... + 39778.

It is an arithmetic number, because the mean of its divisors is an integer number (4492800).

Almost surely, 2^64768861 is an apocalyptic number.

It is an amenable number.

64768861 is a deficient number, since it is larger than the sum of its proper divisors (7115939).

64768861 is a wasteful number, since it uses less digits than its factorization.

64768861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788.

The product of its digits is 387072, while the sum is 46.

The square root of 64768861 is about 8047.9103498983. The cubic root of 64768861 is about 401.5954218624.

The spelling of 64768861 in words is "sixty-four million, seven hundred sixty-eight thousand, eight hundred sixty-one".