2181287560 has 32 divisors (see below), whose sum is σ = 4977028800. Its totient is φ = 860224960.

The previous prime is 2181287551. The next prime is 2181287567. The reversal of 2181287560 is 657821812.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (2181287567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381190 + ... + 386869.

It is an arithmetic number, because the mean of its divisors is an integer number (155532150).

Almost surely, 2^2181287560 is an apocalyptic number.

2181287560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181287560 is an abundant number, since it is smaller than the sum of its proper divisors (2795741240).

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

2181287560 is a wasteful number, since it uses less digits than its factorization.

2181287560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768141 (or 768137 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 2181287560 is about 46704.2563370835. The cubic root of 2181287560 is about 1296.8934818946.

The spelling of 2181287560 in words is "two billion, one hundred eighty-one million, two hundred eighty-seven thousand, five hundred sixty".