63904745 has 4 divisors (see below), whose sum is σ = 76685700. Its totient is φ = 51123792.

The previous prime is 63904727. The next prime is 63904769. The reversal of 63904745 is 54740936.

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 50865424 + 13039321 = 7132^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 63904745 - 2⁶ = 63904681 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 63904699 and 63904708.

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, 6390470 + ... + 6390479.

It is an arithmetic number, because the mean of its divisors is an integer number (19171425).

Almost surely, 2^63904745 is an apocalyptic number.

It is an amenable number.

63904745 is a deficient number, since it is larger than the sum of its proper divisors (12780955).

63904745 is a wasteful number, since it uses less digits than its factorization.

63904745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780954.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 63904745 is about 7994.0443456363. The cubic root of 63904745 is about 399.8014535479.

The spelling of 63904745 in words is "sixty-three million, nine hundred four thousand, seven hundred forty-five".