646383380 has 12 divisors (see below), whose sum is σ = 1357405140. Its totient is φ = 258553344.

The previous prime is 646383359. The next prime is 646383403. The reversal of 646383380 is 83383646.

646383380 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 169572484 + 476810896 = 13022^2 + 21836^2 .

It is a super-2 number, since 2×646383380² = 835622947880448800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16159565 + ... + 16159604.

It is an arithmetic number, because the mean of its divisors is an integer number (113117095).

Almost surely, 2^646383380 is an apocalyptic number.

It is an amenable number.

646383380 is an abundant number, since it is smaller than the sum of its proper divisors (711021760).

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

646383380 is a wasteful number, since it uses less digits than its factorization.

646383380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32319178 (or 32319176 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 646383380 is about 25424.0708778118. The cubic root of 646383380 is about 864.6295227052.

The spelling of 646383380 in words is "six hundred forty-six million, three hundred eighty-three thousand, three hundred eighty".