1271640980 has 24 divisors (see below), whose sum is σ = 2694083112. Its totient is φ = 504154112.

The previous prime is 1271640961. The next prime is 1271640991. The reversal of 1271640980 is 890461721.

It can be written as a sum of positive squares in 4 ways, for example, as 105555076 + 1166085904 = 10274^2 + 34148^2 .

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 7 ways as a sum of consecutive naturals, for example, 279077 + ... + 283596.

It is an arithmetic number, because the mean of its divisors is an integer number (112253463).

Almost surely, 2^1271640980 is an apocalyptic number.

1271640980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271640980 is an abundant number, since it is smaller than the sum of its proper divisors (1422442132).

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

1271640980 is a wasteful number, since it uses less digits than its factorization.

1271640980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562795 (or 562793 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1271640980 is about 35660.0754345809. The cubic root of 1271640980 is about 1083.3983546509.

The spelling of 1271640980 in words is "one billion, two hundred seventy-one million, six hundred forty thousand, nine hundred eighty".