63988499 has 4 divisors (see below), whose sum is σ = 64798560. Its totient is φ = 63178440.

The previous prime is 63988489. The next prime is 63988513. The reversal of 63988499 is 99488936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63988499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63988439) 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, 404912 + ... + 405069.

It is an arithmetic number, because the mean of its divisors is an integer number (16199640).

Almost surely, 2^63988499 is an apocalyptic number.

63988499 is a deficient number, since it is larger than the sum of its proper divisors (810061).

63988499 is an equidigital number, since it uses as much as digits as its factorization.

63988499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810060.

The product of its digits is 3359232, while the sum is 56.

The square root of 63988499 is about 7999.2811552039. The cubic root of 63988499 is about 399.9760381479.

The spelling of 63988499 in words is "sixty-three million, nine hundred eighty-eight thousand, four hundred ninety-nine".