646143320 has 32 divisors (see below), whose sum is σ = 1454695200. Its totient is φ = 258302208.

The previous prime is 646143217. The next prime is 646143341. The reversal of 646143320 is 23341646.

It is a congruent 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, 81701 + ... + 89259.

It is an arithmetic number, because the mean of its divisors is an integer number (45459225).

Almost surely, 2^646143320 is an apocalyptic number.

It is an amenable number.

646143320 is an abundant number, since it is smaller than the sum of its proper divisors (808551880).

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

646143320 is a wasteful number, since it uses less digits than its factorization.

646143320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9707 (or 9703 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 646143320 is about 25419.3493229075. The cubic root of 646143320 is about 864.5224713429.

Adding to 646143320 its reverse (23341646), we get a palindrome (669484966).

The spelling of 646143320 in words is "six hundred forty-six million, one hundred forty-three thousand, three hundred twenty".