63891899 has 16 divisors (see below), whose sum is σ = 71559936. Its totient is φ = 56755200.

The previous prime is 63891887. The next prime is 63891913. The reversal of 63891899 is 99819836.

It is a cyclic number.

It is not a de Polignac number, because 63891899 - 2⁸ = 63891643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63891899.

It is not an unprimeable number, because it can be changed into a prime (63891809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20129 + ... + 23085.

It is an arithmetic number, because the mean of its divisors is an integer number (4472496).

Almost surely, 2^63891899 is an apocalyptic number.

63891899 is a deficient number, since it is larger than the sum of its proper divisors (7668037).

63891899 is a wasteful number, since it uses less digits than its factorization.

63891899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046.

The product of its digits is 839808, while the sum is 53.

The square root of 63891899 is about 7993.2408321031. The cubic root of 63891899 is about 399.7746626649.

The spelling of 63891899 in words is "sixty-three million, eight hundred ninety-one thousand, eight hundred ninety-nine".