63604993 has 2 divisors, whose sum is σ = 63604994. Its totient is φ = 63604992.

The previous prime is 63604967. The next prime is 63604997. The reversal of 63604993 is 39940636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43784689 + 19820304 = 6617^2 + 4452^2 .

It is a cyclic number.

It is not a de Polignac number, because 63604993 - 2⁹ = 63604481 is a prime.

It is not a weakly prime, because it can be changed into another prime (63604997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31802496 + 31802497.

It is an arithmetic number, because the mean of its divisors is an integer number (31802497).

Almost surely, 2^63604993 is an apocalyptic number.

It is an amenable number.

63604993 is a deficient number, since it is larger than the sum of its proper divisors (1).

63604993 is an equidigital number, since it uses as much as digits as its factorization.

63604993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 63604993 is about 7975.2738510975. The cubic root of 63604993 is about 399.1753698812.

The spelling of 63604993 in words is "sixty-three million, six hundred four thousand, nine hundred ninety-three".