2161280 has 64 divisors (see below), whose sum is σ = 5654880. Its totient is φ = 783360.

The previous prime is 2161279. The next prime is 2161297. The reversal of 2161280 is 821612.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2161280² = 9342262476800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6887 + ... + 7193.

2^2161280 is an apocalyptic number.

2161280 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 2161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2827440).

2161280 is an abundant number, since it is smaller than the sum of its proper divisors (3493600).

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

2161280 is a wasteful number, since it uses less digits than its factorization.

2161280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2161280 is about 1470.1292460189. The cubic root of 2161280 is about 129.2916104006.

Adding to 2161280 its reverse (821612), we get a palindrome (2982892).

The spelling of 2161280 in words is "two million, one hundred sixty-one thousand, two hundred eighty".