63964385 has 4 divisors (see below), whose sum is σ = 76757268. Its totient is φ = 51171504.

The previous prime is 63964363. The next prime is 63964391. The reversal of 63964385 is 58346936.

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 37173409 + 26790976 = 6097^2 + 5176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63964385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6396434 + ... + 6396443.

It is an arithmetic number, because the mean of its divisors is an integer number (19189317).

Almost surely, 2^63964385 is an apocalyptic number.

It is an amenable number.

63964385 is a deficient number, since it is larger than the sum of its proper divisors (12792883).

63964385 is a wasteful number, since it uses less digits than its factorization.

63964385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12792882.

The product of its digits is 466560, while the sum is 44.

The square root of 63964385 is about 7997.7737527389. The cubic root of 63964385 is about 399.9257883157.

The spelling of 63964385 in words is "sixty-three million, nine hundred sixty-four thousand, three hundred eighty-five".