6405005380 has 12 divisors (see below), whose sum is σ = 13450511340. Its totient is φ = 2562002144.

The previous prime is 6405005377. The next prime is 6405005389. The reversal of 6405005380 is 835005046.

It can be written as a sum of positive squares in 2 ways, for example, as 3519811584 + 2885193796 = 59328^2 + 53714^2 .

It is not an unprimeable number, because it can be changed into a prime (6405005389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160125115 + ... + 160125154.

It is an arithmetic number, because the mean of its divisors is an integer number (1120875945).

Almost surely, 2^6405005380 is an apocalyptic number.

It is an amenable number.

6405005380 is an abundant number, since it is smaller than the sum of its proper divisors (7045505960).

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

6405005380 is a wasteful number, since it uses less digits than its factorization.

6405005380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320250278 (or 320250276 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 6405005380 is about 80031.2775107333. The cubic root of 6405005380 is about 1857.1194263992.

The spelling of 6405005380 in words is "six billion, four hundred five million, five thousand, three hundred eighty".