6408475728 has 20 divisors (see below), whose sum is σ = 16555229088. Its totient is φ = 2136158560.

The previous prime is 6408475693. The next prime is 6408475793. The reversal of 6408475728 is 8275748046.

It is a super-2 number, since 2×6408475728² = 82137122312730259968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66754908 + ... + 66755003.

Almost surely, 2^6408475728 is an apocalyptic number.

It is an amenable number.

6408475728 is an abundant number, since it is smaller than the sum of its proper divisors (10146753360).

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

6408475728 is a wasteful number, since it uses less digits than its factorization.

6408475728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133509922 (or 133509916 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 51.

The square root of 6408475728 is about 80052.9557730381. The cubic root of 6408475728 is about 1857.4547728289.

The spelling of 6408475728 in words is "six billion, four hundred eight million, four hundred seventy-five thousand, seven hundred twenty-eight".