2173812816 has 80 divisors (see below), whose sum is σ = 6455193984. Its totient is φ = 617482752.

The previous prime is 2173812811. The next prime is 2173812881. The reversal of 2173812816 is 6182183712.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173812811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39430 + ... + 76826.

Almost surely, 2^2173812816 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 2173812816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3227596992).

2173812816 is an abundant number, since it is smaller than the sum of its proper divisors (4281381168).

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

2173812816 is a wasteful number, since it uses less digits than its factorization.

2173812816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37588 (or 37582 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 2173812816 is about 46624.1655796648. The cubic root of 2173812816 is about 1295.4104066360.

The spelling of 2173812816 in words is "two billion, one hundred seventy-three million, eight hundred twelve thousand, eight hundred sixteen".