1271228660 has 48 divisors (see below), whose sum is σ = 2882552400. Its totient is φ = 468132864.

The previous prime is 1271228507. The next prime is 1271228677. The reversal of 1271228660 is 668221721.

It can be written as a sum of positive squares in 8 ways, for example, as 4153444 + 1267075216 = 2038^2 + 35596^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1271228660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94856 + ... + 107424.

It is an arithmetic number, because the mean of its divisors is an integer number (60053175).

Almost surely, 2^1271228660 is an apocalyptic number.

1271228660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271228660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441276200).

1271228660 is an abundant number, since it is smaller than the sum of its proper divisors (1611323740).

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

1271228660 is a wasteful number, since it uses less digits than its factorization.

1271228660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980 (or 12978 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1271228660 is about 35654.2937105757. The cubic root of 1271228660 is about 1083.2812474103.

The spelling of 1271228660 in words is "one billion, two hundred seventy-one million, two hundred twenty-eight thousand, six hundred sixty".