2161287760 has 80 divisors (see below), whose sum is σ = 5208809472. Its totient is φ = 833126400.

The previous prime is 2161287743. The next prime is 2161287797. The reversal of 2161287760 is 677821612.

It is a tau number, because it is divible by the number of its divisors (80).

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

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, 635665 + ... + 639055.

Almost surely, 2^2161287760 is an apocalyptic number.

2161287760 is a gapful number since it is divisible by the number (20) 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 2161287760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604404736).

2161287760 is an abundant number, since it is smaller than the sum of its proper divisors (3047521712).

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

2161287760 is a wasteful number, since it uses less digits than its factorization.

2161287760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692 (or 3686 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2161287760 is about 46489.6521819641. The cubic root of 2161287760 is about 1292.9176513939.

The spelling of 2161287760 in words is "two billion, one hundred sixty-one million, two hundred eighty-seven thousand, seven hundred sixty".