1271629960 has 32 divisors (see below), whose sum is σ = 2862860760. Its totient is φ = 508350976.

The previous prime is 1271629943. The next prime is 1271629987. The reversal of 1271629960 is 699261721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1002735556 + 268894404 = 31666^2 + 16398^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66612 + ... + 83548.

Almost surely, 2^1271629960 is an apocalyptic number.

1271629960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271629960 is an abundant number, since it is smaller than the sum of its proper divisors (1591230800).

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

1271629960 is a wasteful number, since it uses less digits than its factorization.

1271629960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18825 (or 18821 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1271629960 is about 35659.9209197104. The cubic root of 1271629960 is about 1083.3952250768.

The spelling of 1271629960 in words is "one billion, two hundred seventy-one million, six hundred twenty-nine thousand, nine hundred sixty".