6404281281 has 24 divisors (see below), whose sum is σ = 9605368864. Its totient is φ = 4264125120.

The previous prime is 6404281277. The next prime is 6404281307. The reversal of 6404281281 is 1821824046.

6404281281 is a `hidden beast` number, since 640 + 4 + 2 + 8 + 1 + 2 + 8 + 1 = 666.

It is not a de Polignac number, because 6404281281 - 2² = 6404281277 is a prime.

It is a super-2 number, since 2×6404281281² = 82029637452334001922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6404281981) 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 23 ways as a sum of consecutive naturals, for example, 180825 + ... + 213321.

Almost surely, 2^6404281281 is an apocalyptic number.

It is an amenable number.

6404281281 is a deficient number, since it is larger than the sum of its proper divisors (3201087583).

6404281281 is an equidigital number, since it uses as much as digits as its factorization.

6404281281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33323 (or 33311 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 6404281281 is about 80026.7535328030. The cubic root of 6404281281 is about 1857.0494400413.

The spelling of 6404281281 in words is "six billion, four hundred four million, two hundred eighty-one thousand, two hundred eighty-one".