63840305 has 8 divisors (see below), whose sum is σ = 76871592. Its totient is φ = 50896768.

The previous prime is 63840299. The next prime is 63840331. The reversal of 63840305 is 50304836.

It can be written as a sum of positive squares in 4 ways, for example, as 13017664 + 50822641 = 3608^2 + 7129^2 .

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 63840305 - 2²² = 59646001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20324 + ... + 23253.

It is an arithmetic number, because the mean of its divisors is an integer number (9608949).

Almost surely, 2^63840305 is an apocalyptic number.

It is an amenable number.

63840305 is a deficient number, since it is larger than the sum of its proper divisors (13031287).

63840305 is a wasteful number, since it uses less digits than its factorization.

63840305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43875.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 63840305 is about 7990.0128285254. The cubic root of 63840305 is about 399.6670249793.

The spelling of 63840305 in words is "sixty-three million, eight hundred forty thousand, three hundred five".