1261712560 has 20 divisors (see below), whose sum is σ = 2933481888. Its totient is φ = 504684992.

The previous prime is 1261712527. The next prime is 1261712567. The reversal of 1261712560 is 652171621.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1261712567) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7885624 + ... + 7885783.

Almost surely, 2^1261712560 is an apocalyptic number.

1261712560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261712560 is an abundant number, since it is smaller than the sum of its proper divisors (1671769328).

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

1261712560 is a wasteful number, since it uses less digits than its factorization.

1261712560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15771420 (or 15771414 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1261712560 is about 35520.5934635107. The cubic root of 1261712560 is about 1080.5714168660.

The spelling of 1261712560 in words is "one billion, two hundred sixty-one million, seven hundred twelve thousand, five hundred sixty".