64695917 has 16 divisors (see below), whose sum is σ = 76655040. Its totient is φ = 54275760.

The previous prime is 64695913. The next prime is 64695947. The reversal of 64695917 is 71959646.

It is not a de Polignac number, because 64695917 - 2² = 64695913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64695913) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15434 + ... + 19172.

It is an arithmetic number, because the mean of its divisors is an integer number (4790940).

Almost surely, 2^64695917 is an apocalyptic number.

It is an amenable number.

64695917 is a deficient number, since it is larger than the sum of its proper divisors (11959123).

64695917 is a wasteful number, since it uses less digits than its factorization.

64695917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785 (or 3763 counting only the distinct ones).

The product of its digits is 408240, while the sum is 47.

The square root of 64695917 is about 8043.3772135839. The cubic root of 64695917 is about 401.4446036037. Note that the first 3 decimals are identical.

The spelling of 64695917 in words is "sixty-four million, six hundred ninety-five thousand, nine hundred seventeen".