2991437568 has 360 divisors, whose sum is σ = 10488516192. Its totient is φ = 830103552.

The previous prime is 2991437563. The next prime is 2991437573. The reversal of 2991437568 is 8657341992.

It is an interprime number because it is at equal distance from previous prime (2991437563) and next prime (2991437573).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991437563) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5370346 + ... + 5370902.

Almost surely, 2^2991437568 is an apocalyptic number.

2991437568 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 2991437568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5244258096).

2991437568 is an abundant number, since it is smaller than the sum of its proper divisors (7497078624).

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

2991437568 is an equidigital number, since it uses as much as digits as its factorization.

2991437568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 606 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 2991437568 is about 54694.0359454301. The cubic root of 2991437568 is about 1440.8761334961.

The spelling of 2991437568 in words is "two billion, nine hundred ninety-one million, four hundred thirty-seven thousand, five hundred sixty-eight".