63904385 has 4 divisors (see below), whose sum is σ = 76685268. Its totient is φ = 51123504.

The previous prime is 63904381. The next prime is 63904453. The reversal of 63904385 is 58340936.

63904385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27952369 + 35952016 = 5287^2 + 5996^2 .

It is a cyclic number.

It is not a de Polignac number, because 63904385 - 2² = 63904381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63904381) 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 3 ways as a sum of consecutive naturals, for example, 6390434 + ... + 6390443.

It is an arithmetic number, because the mean of its divisors is an integer number (19171317).

Almost surely, 2^63904385 is an apocalyptic number.

It is an amenable number.

63904385 is a deficient number, since it is larger than the sum of its proper divisors (12780883).

63904385 is a wasteful number, since it uses less digits than its factorization.

63904385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780882.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 63904385 is about 7994.0218288419. The cubic root of 63904385 is about 399.8007028014.

The spelling of 63904385 in words is "sixty-three million, nine hundred four thousand, three hundred eighty-five".