6406961380 has 12 divisors (see below), whose sum is σ = 13454618940. Its totient is φ = 2562784544.

The previous prime is 6406961371. The next prime is 6406961381. The reversal of 6406961380 is 831696046.

It can be written as a sum of positive squares in 2 ways, for example, as 2683032804 + 3723928576 = 51798^2 + 61024^2 .

It is not an unprimeable number, because it can be changed into a prime (6406961381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160174015 + ... + 160174054.

It is an arithmetic number, because the mean of its divisors is an integer number (1121218245).

Almost surely, 2^6406961380 is an apocalyptic number.

It is an amenable number.

6406961380 is an abundant number, since it is smaller than the sum of its proper divisors (7047657560).

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

6406961380 is a wasteful number, since it uses less digits than its factorization.

6406961380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320348078 (or 320348076 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 6406961380 is about 80043.4968001773. The cubic root of 6406961380 is about 1857.3084533488.

The spelling of 6406961380 in words is "six billion, four hundred six million, nine hundred sixty-one thousand, three hundred eighty".