1281432560 has 20 divisors (see below), whose sum is σ = 2979330888. Its totient is φ = 512572992.

The previous prime is 1281432497. The next prime is 1281432563. The reversal of 1281432560 is 652341821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281432563) 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, 8008874 + ... + 8009033.

Almost surely, 2^1281432560 is an apocalyptic number.

1281432560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281432560 is an abundant number, since it is smaller than the sum of its proper divisors (1697898328).

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

1281432560 is a wasteful number, since it uses less digits than its factorization.

1281432560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16017920 (or 16017914 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1281432560 is about 35797.1026760547. The cubic root of 1281432560 is about 1086.1719545884.

The spelling of 1281432560 in words is "one billion, two hundred eighty-one million, four hundred thirty-two thousand, five hundred sixty".