1276845885 has 96 divisors (see below), whose sum is σ = 2674863360. Its totient is φ = 550416384.

The previous prime is 1276845859. The next prime is 1276845929. The reversal of 1276845885 is 5885486721.

1276845885 is a `hidden beast` number, since 127 + 68 + 458 + 8 + 5 = 666.

It is not a de Polignac number, because 1276845885 - 2⁵ = 1276845853 is a prime.

Its product of digits (4300800) is a multiple of the sum of its prime divisors (1024).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1896909 + ... + 1897581.

It is an arithmetic number, because the mean of its divisors is an integer number (27863160).

Almost surely, 2^1276845885 is an apocalyptic number.

1276845885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1276845885 is an abundant number, since it is smaller than the sum of its proper divisors (1398017475).

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

1276845885 is a wasteful number, since it uses less digits than its factorization.

1276845885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027 (or 1024 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The square root of 1276845885 is about 35732.9803542889. The cubic root of 1276845885 is about 1084.8744812928.

It can be divided in two parts, 12768 and 45885, that added together give a triangular number (58653 = T₃₄₂).

The spelling of 1276845885 in words is "one billion, two hundred seventy-six million, eight hundred forty-five thousand, eight hundred eighty-five".