646213960 has 96 divisors (see below), whose sum is σ = 1749843000. Its totient is φ = 213900288.

The previous prime is 646213943. The next prime is 646213969. The reversal of 646213960 is 69312646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 542051524 + 104162436 = 23282^2 + 10206^2 .

It is not an unprimeable number, because it can be changed into a prime (646213969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51156 + ... + 62524.

Almost surely, 2^646213960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646213960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874921500).

646213960 is an abundant number, since it is smaller than the sum of its proper divisors (1103629040).

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

646213960 is a wasteful number, since it uses less digits than its factorization.

646213960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11423 (or 11412 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 646213960 is about 25420.7387776201. The cubic root of 646213960 is about 864.5539750048.

The spelling of 646213960 in words is "six hundred forty-six million, two hundred thirteen thousand, nine hundred sixty".