646331398 has 32 divisors (see below), whose sum is σ = 1084406400. Its totient is φ = 287121024.

The previous prime is 646331377. The next prime is 646331461. The reversal of 646331398 is 893133646.

It is a congruent number.

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, 196693 + ... + 199951.

It is an arithmetic number, because the mean of its divisors is an integer number (33887700).

Almost surely, 2^646331398 is an apocalyptic number.

646331398 is a deficient number, since it is larger than the sum of its proper divisors (438075002).

646331398 is a wasteful number, since it uses less digits than its factorization.

646331398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604.

The product of its digits is 279936, while the sum is 43.

The square root of 646331398 is about 25423.0485583456. The cubic root of 646331398 is about 864.6063443159.

The spelling of 646331398 in words is "six hundred forty-six million, three hundred thirty-one thousand, three hundred ninety-eight".