2173855320 has 640 divisors, whose sum is σ = 9206144640. Its totient is φ = 447897600.

The previous prime is 2173855319. The next prime is 2173855361. The reversal of 2173855320 is 235583712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 21523270 + ... + 21523370.

It is an arithmetic number, because the mean of its divisors is an integer number (14384601).

Almost surely, 2^2173855320 is an apocalyptic number.

2173855320 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 2173855320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4603072320).

2173855320 is an abundant number, since it is smaller than the sum of its proper divisors (7032289320).

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

2173855320 is a wasteful number, since it uses less digits than its factorization.

2173855320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 2173855320 is about 46624.6213925647. The cubic root of 2173855320 is about 1295.4188495226.

The spelling of 2173855320 in words is "two billion, one hundred seventy-three million, eight hundred fifty-five thousand, three hundred twenty".