64863899 has 4 divisors (see below), whose sum is σ = 64912920. Its totient is φ = 64814880.

The previous prime is 64863893. The next prime is 64863907. The reversal of 64863899 is 99836846.

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-64863899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64863899.

It is not an unprimeable number, because it can be changed into a prime (64863893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22469 + ... + 25190.

It is an arithmetic number, because the mean of its divisors is an integer number (16228230).

Almost surely, 2^64863899 is an apocalyptic number.

64863899 is a deficient number, since it is larger than the sum of its proper divisors (49021).

64863899 is a wasteful number, since it uses less digits than its factorization.

64863899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49020.

The product of its digits is 2239488, while the sum is 53.

The square root of 64863899 is about 8053.8126995852. The cubic root of 64863899 is about 401.7917516645.

The spelling of 64863899 in words is "sixty-four million, eight hundred sixty-three thousand, eight hundred ninety-nine".