63664949 has 4 divisors (see below), whose sum is σ = 67409964. Its totient is φ = 59919936.

The previous prime is 63664933. The next prime is 63664957. The reversal of 63664949 is 94946636.

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 55502500 + 8162449 = 7450^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 63664949 - 2⁴ = 63664933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63664969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1872482 + ... + 1872515.

It is an arithmetic number, because the mean of its divisors is an integer number (16852491).

Almost surely, 2^63664949 is an apocalyptic number.

It is an amenable number.

63664949 is a deficient number, since it is larger than the sum of its proper divisors (3745015).

63664949 is a wasteful number, since it uses less digits than its factorization.

63664949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745014.

The product of its digits is 839808, while the sum is 47.

The square root of 63664949 is about 7979.0318334996. The cubic root of 63664949 is about 399.3007554382.

The spelling of 63664949 in words is "sixty-three million, six hundred sixty-four thousand, nine hundred forty-nine".