64005645 has 16 divisors (see below), whose sum is σ = 111719232. Its totient is φ = 31032960.

The previous prime is 64005541. The next prime is 64005647. The reversal of 64005645 is 54650046.

It is not a de Polignac number, because 64005645 - 2¹⁰ = 64004621 is a prime.

It is a super-3 number, since 3×64005645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64005647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193792 + ... + 194121.

It is an arithmetic number, because the mean of its divisors is an integer number (6982452).

Almost surely, 2^64005645 is an apocalyptic number.

It is an amenable number.

64005645 is a deficient number, since it is larger than the sum of its proper divisors (47713587).

64005645 is a wasteful number, since it uses less digits than its factorization.

64005645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387932.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 64005645 is about 8000.3528047206. The cubic root of 64005645 is about 400.0117600709.

The spelling of 64005645 in words is "sixty-four million, five thousand, six hundred forty-five".