2891224220 has 24 divisors (see below), whose sum is σ = 6093037104. Its totient is φ = 1152400896.

The previous prime is 2891224181. The next prime is 2891224229. The reversal of 2891224220 is 224221982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891224229) 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, 249749 + ... + 261068.

It is an arithmetic number, because the mean of its divisors is an integer number (253876546).

Almost surely, 2^2891224220 is an apocalyptic number.

2891224220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2891224220 is an abundant number, since it is smaller than the sum of its proper divisors (3201812884).

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

2891224220 is a wasteful number, since it uses less digits than its factorization.

2891224220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511109 (or 511107 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2891224220 is about 53770.1052630549. The cubic root of 2891224220 is about 1424.6032292294.

The spelling of 2891224220 in words is "two billion, eight hundred ninety-one million, two hundred twenty-four thousand, two hundred twenty".