2891009898 has 72 divisors (see below), whose sum is σ = 7378937280. Its totient is φ = 815527440.

The previous prime is 2891009897. The next prime is 2891009929. The reversal of 2891009898 is 8989001982.

It is a happy number.

2891009898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2891009897) 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, 48933 + ... + 90423.

It is an arithmetic number, because the mean of its divisors is an integer number (102485240).

Almost surely, 2^2891009898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2891009898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3689468640).

2891009898 is an abundant number, since it is smaller than the sum of its proper divisors (4487927382).

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

2891009898 is a wasteful number, since it uses less digits than its factorization.

2891009898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41592 (or 41582 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 2891009898 is about 53768.1122785615. The cubic root of 2891009898 is about 1424.5680271449.

The spelling of 2891009898 in words is "two billion, eight hundred ninety-one million, nine thousand, eight hundred ninety-eight".