6404520140 has 24 divisors (see below), whose sum is σ = 13530035232. Its totient is φ = 2546466560.

The previous prime is 6404520137. The next prime is 6404520197. The reversal of 6404520140 is 410254046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955421 + ... + 962100.

It is an arithmetic number, because the mean of its divisors is an integer number (563751468).

Almost surely, 2^6404520140 is an apocalyptic number.

It is an amenable number.

6404520140 is an abundant number, since it is smaller than the sum of its proper divisors (7125515092).

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

6404520140 is a wasteful number, since it uses less digits than its factorization.

6404520140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917697 (or 1917695 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 6404520140 is about 80028.2458885611. The cubic root of 6404520140 is about 1857.0725270689.

Adding to 6404520140 its reverse (410254046), we get a palindrome (6814774186).

The spelling of 6404520140 in words is "six billion, four hundred four million, five hundred twenty thousand, one hundred forty".