1276540668 has 48 divisors (see below), whose sum is σ = 3564134560. Its totient is φ = 392781312.

The previous prime is 1276540667. The next prime is 1276540673. The reversal of 1276540668 is 8660456721.

1276540668 is a `hidden beast` number, since 127 + 65 + 406 + 68 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276540667) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 453205 + ... + 456012.

Almost surely, 2^1276540668 is an apocalyptic number.

1276540668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1276540668 is an abundant number, since it is smaller than the sum of its proper divisors (2287593892).

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

1276540668 is a wasteful number, since it uses less digits than its factorization.

1276540668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909243 (or 909235 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1276540668 is about 35728.7092965867. The cubic root of 1276540668 is about 1084.7880316735.

The spelling of 1276540668 in words is "one billion, two hundred seventy-six million, five hundred forty thousand, six hundred sixty-eight".