2170780164 has 108 divisors (see below), whose sum is σ = 6519187584. Its totient is φ = 607003488.

The previous prime is 2170780163. The next prime is 2170780187. The reversal of 2170780164 is 4610870712.

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

It is not an unprimeable number, because it can be changed into a prime (2170780163) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 69817 + ... + 95999.

It is an arithmetic number, because the mean of its divisors is an integer number (60362848).

Almost surely, 2^2170780164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2170780164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3259593792).

2170780164 is an abundant number, since it is smaller than the sum of its proper divisors (4348407420).

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

2170780164 is a wasteful number, since it uses less digits than its factorization.

2170780164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26254 (or 26242 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 2170780164 is about 46591.6319096037. The cubic root of 2170780164 is about 1294.8077240706.

The spelling of 2170780164 in words is "two billion, one hundred seventy million, seven hundred eighty thousand, one hundred sixty-four".