2190891808 has 48 divisors (see below), whose sum is σ = 4947191424. Its totient is φ = 935585280.

The previous prime is 2190891763. The next prime is 2190891809. The reversal of 2190891808 is 8081980912.

It is not an unprimeable number, because it can be changed into a prime (2190891809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45541 + ... + 80347.

It is an arithmetic number, because the mean of its divisors is an integer number (103066488).

Almost surely, 2^2190891808 is an apocalyptic number.

2190891808 is a gapful number since it is divisible by the number (28) 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 2190891808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2473595712).

2190891808 is an abundant number, since it is smaller than the sum of its proper divisors (2756299616).

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

2190891808 is a wasteful number, since it uses less digits than its factorization.

2190891808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35105 (or 35097 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 46.

The square root of 2190891808 is about 46806.9632426629. The cubic root of 2190891808 is about 1298.7941101557.

The spelling of 2190891808 in words is "two billion, one hundred ninety million, eight hundred ninety-one thousand, eight hundred eight".