2161285280 has 192 divisors, whose sum is σ = 6572482560. Its totient is φ = 651801600.

The previous prime is 2161285277. The next prime is 2161285303. The reversal of 2161285280 is 825821612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 2161285280.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379091 + ... + 384749.

It is an arithmetic number, because the mean of its divisors is an integer number (34231680).

Almost surely, 2^2161285280 is an apocalyptic number.

2161285280 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 2161285280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3286241280).

2161285280 is an abundant number, since it is smaller than the sum of its proper divisors (4411197280).

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

2161285280 is a wasteful number, since it uses less digits than its factorization.

2161285280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723 (or 5715 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 2161285280 is about 46489.6255093542. The cubic root of 2161285280 is about 1292.9171568682.

The spelling of 2161285280 in words is "two billion, one hundred sixty-one million, two hundred eighty-five thousand, two hundred eighty".