6340409128 has 32 divisors (see below), whose sum is σ = 12141009000. Its totient is φ = 3103513600.

The previous prime is 6340409123. The next prime is 6340409129. The reversal of 6340409128 is 8219040436.

It can be written as a sum of positive squares in 4 ways, for example, as 5922533764 + 417875364 = 76958^2 + 20442^2 .

It is not an unprimeable number, because it can be changed into a prime (6340409123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27828 + ... + 115996.

Almost surely, 2^6340409128 is an apocalyptic number.

It is an amenable number.

6340409128 is a deficient number, since it is larger than the sum of its proper divisors (5800599872).

6340409128 is a wasteful number, since it uses less digits than its factorization.

6340409128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88365 (or 88361 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 6340409128 is about 79626.6860292452. The cubic root of 6340409128 is about 1850.8551321093.

The spelling of 6340409128 in words is "six billion, three hundred forty million, four hundred nine thousand, one hundred twenty-eight".