2991389616 has 100 divisors (see below), whose sum is σ = 8892090592. Its totient is φ = 970164864.

The previous prime is 2991389603. The next prime is 2991389627. The reversal of 2991389616 is 6169831992.

2991389616 is a `hidden beast` number, since 2 + 9 + 9 + 13 + 8 + 9 + 616 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16761 + ... + 79143.

Almost surely, 2^2991389616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2991389616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4446045296).

2991389616 is an abundant number, since it is smaller than the sum of its proper divisors (5900700976).

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

2991389616 is a wasteful number, since it uses less digits than its factorization.

2991389616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62440 (or 62425 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 2991389616 is about 54693.5975777787. The cubic root of 2991389616 is about 1440.8684344930.

The spelling of 2991389616 in words is "two billion, nine hundred ninety-one million, three hundred eighty-nine thousand, six hundred sixteen".