6405816380 has 48 divisors (see below), whose sum is σ = 14178719520. Its totient is φ = 2427280128.

The previous prime is 6405816379. The next prime is 6405816397. The reversal of 6405816380 is 836185046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73454 + ... + 134933.

It is an arithmetic number, because the mean of its divisors is an integer number (295389990).

Almost surely, 2^6405816380 is an apocalyptic number.

It is an amenable number.

6405816380 is an abundant number, since it is smaller than the sum of its proper divisors (7772903140).

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

6405816380 is a wasteful number, since it uses less digits than its factorization.

6405816380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208478 (or 208476 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 6405816380 is about 80036.3441194062. The cubic root of 6405816380 is about 1857.1978057396.

The spelling of 6405816380 in words is "six billion, four hundred five million, eight hundred sixteen thousand, three hundred eighty".