646843898 has 16 divisors (see below), whose sum is σ = 1004330880. Its totient is φ = 312080496.

The previous prime is 646843859. The next prime is 646843909. The reversal of 646843898 is 898348646.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165515 + ... + 169377.

It is an arithmetic number, because the mean of its divisors is an integer number (62770680).

Almost surely, 2^646843898 is an apocalyptic number.

646843898 is a deficient number, since it is larger than the sum of its proper divisors (357486982).

646843898 is a wasteful number, since it uses less digits than its factorization.

646843898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781.

The product of its digits is 7962624, while the sum is 56.

The square root of 646843898 is about 25433.1259974074. The cubic root of 646843898 is about 864.8348100250.

The spelling of 646843898 in words is "six hundred forty-six million, eight hundred forty-three thousand, eight hundred ninety-eight".