2991857664 has 224 divisors, whose sum is σ = 8555857920. Its totient is φ = 927793152.

The previous prime is 2991857663. The next prime is 2991857669. The reversal of 2991857664 is 4667581992.

It is not an unprimeable number, because it can be changed into a prime (2991857663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37871577 + ... + 37871655.

Almost surely, 2^2991857664 is an apocalyptic number.

2991857664 is a gapful number since it is divisible by the number (24) 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 2991857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4277928960).

2991857664 is an abundant number, since it is smaller than the sum of its proper divisors (5564000256).

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

2991857664 is an equidigital number, since it uses as much as digits as its factorization.

2991857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 174 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 57.

The square root of 2991857664 is about 54697.8762293382. The cubic root of 2991857664 is about 1440.9435791031.

The spelling of 2991857664 in words is "two billion, nine hundred ninety-one million, eight hundred fifty-seven thousand, six hundred sixty-four".