2991133440 has 576 divisors, whose sum is σ = 11443783680. Its totient is φ = 738017280.

The previous prime is 2991133433. The next prime is 2991133441. The reversal of 2991133440 is 443311992.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2991133395 and 2991133404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991133441) 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, 42128605 + ... + 42128675.

It is an arithmetic number, because the mean of its divisors is an integer number (19867680).

Almost surely, 2^2991133440 is an apocalyptic number.

2991133440 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 2991133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5721891840).

2991133440 is an abundant number, since it is smaller than the sum of its proper divisors (8452650240).

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

2991133440 is a wasteful number, since it uses less digits than its factorization.

2991133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 2991133440 is about 54691.2556081866. The cubic root of 2991133440 is about 1440.8273023887.

The spelling of 2991133440 in words is "two billion, nine hundred ninety-one million, one hundred thirty-three thousand, four hundred forty".