64520417 has 4 divisors (see below), whose sum is σ = 69483540. Its totient is φ = 59557296.

The previous prime is 64520411. The next prime is 64520419. The reversal of 64520417 is 71402546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71402546 = 2 ⋅35701273.

It can be written as a sum of positive squares in 2 ways, for example, as 15085456 + 49434961 = 3884^2 + 7031^2 .

It is a cyclic number.

It is not a de Polignac number, because 64520417 - 2⁶ = 64520353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64520417.

It is not an unprimeable number, because it can be changed into a prime (64520411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481542 + ... + 2481567.

It is an arithmetic number, because the mean of its divisors is an integer number (17370885).

Almost surely, 2^64520417 is an apocalyptic number.

It is an amenable number.

64520417 is a deficient number, since it is larger than the sum of its proper divisors (4963123).

64520417 is a wasteful number, since it uses less digits than its factorization.

64520417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963122.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 64520417 is about 8032.4602084293. The cubic root of 64520417 is about 401.0812765522.

The spelling of 64520417 in words is "sixty-four million, five hundred twenty thousand, four hundred seventeen".