663839898 has 32 divisors (see below), whose sum is σ = 1398753600. Its totient is φ = 209454336.

The previous prime is 663839843. The next prime is 663839909. The reversal of 663839898 is 898938366.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211968 + ... + 215076.

It is an arithmetic number, because the mean of its divisors is an integer number (43711050).

Almost surely, 2^663839898 is an apocalyptic number.

663839898 is an abundant number, since it is smaller than the sum of its proper divisors (734913702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663839898 is a wasteful number, since it uses less digits than its factorization.

663839898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006.

The product of its digits is 13436928, while the sum is 60.

The square root of 663839898 is about 25765.0906848783. The cubic root of 663839898 is about 872.3440105584.

The spelling of 663839898 in words is "six hundred sixty-three million, eight hundred thirty-nine thousand, eight hundred ninety-eight".