64797665 has 4 divisors (see below), whose sum is σ = 77757204. Its totient is φ = 51838128.

The previous prime is 64797613. The next prime is 64797673. The reversal of 64797665 is 56679746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34668544 + 30129121 = 5888^2 + 5489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64797665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6479762 + ... + 6479771.

It is an arithmetic number, because the mean of its divisors is an integer number (19439301).

Almost surely, 2^64797665 is an apocalyptic number.

It is an amenable number.

64797665 is a deficient number, since it is larger than the sum of its proper divisors (12959539).

64797665 is a wasteful number, since it uses less digits than its factorization.

64797665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12959538.

The product of its digits is 1905120, while the sum is 50.

The square root of 64797665 is about 8049.6996838391. The cubic root of 64797665 is about 401.6549455286.

The spelling of 64797665 in words is "sixty-four million, seven hundred ninety-seven thousand, six hundred sixty-five".