2891888220 has 192 divisors, whose sum is σ = 8968458240. Its totient is φ = 691891200.

The previous prime is 2891888161. The next prime is 2891888221. The reversal of 2891888220 is 228881982.

It is a self number, because there is not a number n which added to its sum of digits gives 2891888220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891888221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4374690 + ... + 4375350.

It is an arithmetic number, because the mean of its divisors is an integer number (46710720).

Almost surely, 2^2891888220 is an apocalyptic number.

2891888220 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 2891888220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4484229120).

2891888220 is an abundant number, since it is smaller than the sum of its proper divisors (6076570020).

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

2891888220 is a wasteful number, since it uses less digits than its factorization.

2891888220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 48.

The square root of 2891888220 is about 53776.2793432197. The cubic root of 2891888220 is about 1424.7122792450.

The spelling of 2891888220 in words is "two billion, eight hundred ninety-one million, eight hundred eighty-eight thousand, two hundred twenty".