64505917 has 8 divisors (see below), whose sum is σ = 73817216. Its totient is φ = 55218672.

The previous prime is 64505899. The next prime is 64505923. The reversal of 64505917 is 71950546.

64505917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64505917 - 2⁷ = 64505789 is a prime.

It is a super-2 number, since 2×64505917² = 8322026656021778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64505927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163 + ... + 11359.

It is an arithmetic number, because the mean of its divisors is an integer number (9227152).

Almost surely, 2^64505917 is an apocalyptic number.

It is an amenable number.

64505917 is a deficient number, since it is larger than the sum of its proper divisors (9311299).

64505917 is a wasteful number, since it uses less digits than its factorization.

64505917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12027.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 64505917 is about 8031.5575699860. The cubic root of 64505917 is about 401.0512286257.

The spelling of 64505917 in words is "sixty-four million, five hundred five thousand, nine hundred seventeen".