64928165 has 4 divisors (see below), whose sum is σ = 77913804. Its totient is φ = 51942528.

The previous prime is 64928147. The next prime is 64928173. The reversal of 64928165 is 56182946.

It is a happy number.

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 43850884 + 21077281 = 6622^2 + 4591^2 .

It is a cyclic number.

It is not a de Polignac number, because 64928165 - 2⁸ = 64927909 is a prime.

It is a super-2 number, since 2×64928165² = 8431333220534450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 6492812 + ... + 6492821.

It is an arithmetic number, because the mean of its divisors is an integer number (19478451).

Almost surely, 2^64928165 is an apocalyptic number.

It is an amenable number.

64928165 is a deficient number, since it is larger than the sum of its proper divisors (12985639).

64928165 is a wasteful number, since it uses less digits than its factorization.

64928165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12985638.

The product of its digits is 103680, while the sum is 41.

The square root of 64928165 is about 8057.8014991684. The cubic root of 64928165 is about 401.9244039100.

The spelling of 64928165 in words is "sixty-four million, nine hundred twenty-eight thousand, one hundred sixty-five".