1280788375005 has 24 divisors (see below), whose sum is σ = 2220223568472. Its totient is φ = 683028553344.

The previous prime is 1280788374967. The next prime is 1280788375051. The reversal of 1280788375005 is 5005738870821.

1280788375005 is a `hidden beast` number, since 1 + 28 + 0 + 7 + 88 + 37 + 500 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4760586009 + 1276027788996 = 68997^2 + 1129614^2 .

It is not a de Polignac number, because 1280788375005 - 2⁶ = 1280788374941 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687294 + ... + 1741823.

It is an arithmetic number, because the mean of its divisors is an integer number (92509315353).

Almost surely, 2^{1280788375005} is an apocalyptic number.

1280788375005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280788375005 is a deficient number, since it is larger than the sum of its proper divisors (939435193467).

1280788375005 is a wasteful number, since it uses less digits than its factorization.

1280788375005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440845 (or 2440842 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 1280788375005 in words is "one trillion, two hundred eighty billion, seven hundred eighty-eight million, three hundred seventy-five thousand, five".