64787165 has 4 divisors (see below), whose sum is σ = 77744604. Its totient is φ = 51829728.

The previous prime is 64787161. The next prime is 64787171. The reversal of 64787165 is 56178746.

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 16859236 + 47927929 = 4106^2 + 6923^2 .

It is a cyclic number.

It is not a de Polignac number, because 64787165 - 2² = 64787161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64787161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6478712 + ... + 6478721.

It is an arithmetic number, because the mean of its divisors is an integer number (19436151).

Almost surely, 2^64787165 is an apocalyptic number.

It is an amenable number.

64787165 is a deficient number, since it is larger than the sum of its proper divisors (12957439).

64787165 is a wasteful number, since it uses less digits than its factorization.

64787165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12957438.

The product of its digits is 282240, while the sum is 44.

The square root of 64787165 is about 8049.0474591718. The cubic root of 64787165 is about 401.6332492491.

The spelling of 64787165 in words is "sixty-four million, seven hundred eighty-seven thousand, one hundred sixty-five".