64945285 has 4 divisors (see below), whose sum is σ = 77934348. Its totient is φ = 51956224.

The previous prime is 64945277. The next prime is 64945291. The reversal of 64945285 is 58254946.

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 42068196 + 22877089 = 6486^2 + 4783^2 .

It is a cyclic number.

It is not a de Polignac number, because 64945285 - 2³ = 64945277 is a prime.

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, 6494524 + ... + 6494533.

It is an arithmetic number, because the mean of its divisors is an integer number (19483587).

Almost surely, 2^64945285 is an apocalyptic number.

It is an amenable number.

64945285 is a deficient number, since it is larger than the sum of its proper divisors (12989063).

64945285 is a wasteful number, since it uses less digits than its factorization.

64945285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12989062.

The product of its digits is 345600, while the sum is 43.

The square root of 64945285 is about 8058.8637536566. The cubic root of 64945285 is about 401.9597267477.

The spelling of 64945285 in words is "sixty-four million, nine hundred forty-five thousand, two hundred eighty-five".