2991128 has 32 divisors (see below), whose sum is σ = 6620160. Its totient is φ = 1239840.

The previous prime is 2991103. The next prime is 2991139. The reversal of 2991128 is 8211992.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2991094 and 2991103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875 + ... + 2597.

It is an arithmetic number, because the mean of its divisors is an integer number (206880).

2^2991128 is an apocalyptic number.

2991128 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 2991128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3310080).

2991128 is an abundant number, since it is smaller than the sum of its proper divisors (3629032).

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

2991128 is a wasteful number, since it uses less digits than its factorization.

2991128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767 (or 1763 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 2991128 is about 1729.4877854440. The cubic root of 2991128 is about 144.0826428906.

The spelling of 2991128 in words is "two million, nine hundred ninety-one thousand, one hundred twenty-eight".