646420264 has 32 divisors (see below), whose sum is σ = 1386017280. Its totient is φ = 276871104.

The previous prime is 646420241. The next prime is 646420289. The reversal of 646420264 is 462024646.

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, 154569 + ... + 158695.

It is an arithmetic number, because the mean of its divisors is an integer number (43313040).

Almost surely, 2^646420264 is an apocalyptic number.

It is an amenable number.

646420264 is an abundant number, since it is smaller than the sum of its proper divisors (739597016).

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

646420264 is a wasteful number, since it uses less digits than its factorization.

646420264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6937 (or 6933 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 646420264 is about 25424.7962430380. The cubic root of 646420264 is about 864.6459682542.

The spelling of 646420264 in words is "six hundred forty-six million, four hundred twenty thousand, two hundred sixty-four".