63899999 has 8 divisors (see below), whose sum is σ = 65749728. Its totient is φ = 62056800.

The previous prime is 63899987. The next prime is 63900007. The reversal of 63899999 is 99999836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63899999 is a prime.

It is a Duffinian number.

63899999 is a modest number, since divided by 9999 gives 6389 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63899399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23774 + ... + 26324.

It is an arithmetic number, because the mean of its divisors is an integer number (8218716).

Almost surely, 2^63899999 is an apocalyptic number.

63899999 is a deficient number, since it is larger than the sum of its proper divisors (1849729).

63899999 is a wasteful number, since it uses less digits than its factorization.

63899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265.

The product of its digits is 8503056, while the sum is 62.

The square root of 63899999 is about 7993.7474941357. The cubic root of 63899999 is about 399.7915559799.

The spelling of 63899999 in words is "sixty-three million, eight hundred ninety-nine thousand, nine hundred ninety-nine".