646810402 has 8 divisors (see below), whose sum is σ = 1108817856. Its totient is φ = 277204452.

The previous prime is 646810379. The next prime is 646810427. The reversal of 646810402 is 204018646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×646810402² = 836727392270803208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23100358 + ... + 23100385.

It is an arithmetic number, because the mean of its divisors is an integer number (138602232).

Almost surely, 2^646810402 is an apocalyptic number.

646810402 is a deficient number, since it is larger than the sum of its proper divisors (462007454).

646810402 is a wasteful number, since it uses less digits than its factorization.

646810402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46200752.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 646810402 is about 25432.4674776161. The cubic root of 646810402 is about 864.8198816386.

The spelling of 646810402 in words is "six hundred forty-six million, eight hundred ten thousand, four hundred two".