1261047880 has 16 divisors (see below), whose sum is σ = 2837357820. Its totient is φ = 504419136.

The previous prime is 1261047863. The next prime is 1261047881. The reversal of 1261047880 is 887401621.

It can be written as a sum of positive squares in 2 ways, for example, as 1178274276 + 82773604 = 34326^2 + 9098^2 .

It is not an unprimeable number, because it can be changed into a prime (1261047881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15763059 + ... + 15763138.

Almost surely, 2^1261047880 is an apocalyptic number.

1261047880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261047880 is an abundant number, since it is smaller than the sum of its proper divisors (1576309940).

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

1261047880 is a wasteful number, since it uses less digits than its factorization.

1261047880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31526208 (or 31526204 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1261047880 is about 35511.2359683523. The cubic root of 1261047880 is about 1080.3816323903.

The spelling of 1261047880 in words is "one billion, two hundred sixty-one million, forty-seven thousand, eight hundred eighty".