6408002781 has 12 divisors (see below), whose sum is σ = 9302519200. Its totient is φ = 4250533320.

The previous prime is 6408002779. The next prime is 6408002813. The reversal of 6408002781 is 1872008046.

6408002781 is a `hidden beast` number, since 640 + 8 + 0 + 0 + 2 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 6408002781 - 2¹ = 6408002779 is a prime.

It is a super-2 number, since 2×6408002781² = 82124999282607467922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408002771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1787155 + ... + 1790736.

Almost surely, 2^6408002781 is an apocalyptic number.

It is an amenable number.

6408002781 is a deficient number, since it is larger than the sum of its proper divisors (2894516419).

6408002781 is a wasteful number, since it uses less digits than its factorization.

6408002781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578096 (or 3578093 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 6408002781 is about 80050.0017551530. The cubic root of 6408002781 is about 1857.4090781733.

The spelling of 6408002781 in words is "six billion, four hundred eight million, two thousand, seven hundred eighty-one".