2991071728 has 20 divisors (see below), whose sum is σ = 5918505120. Its totient is φ = 1463715584.

The previous prime is 2991071717. The next prime is 2991071767. The reversal of 2991071728 is 8271701992.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987993 + ... + 1989496.

It is an arithmetic number, because the mean of its divisors is an integer number (295925256).

Almost surely, 2^2991071728 is an apocalyptic number.

It is an amenable number.

2991071728 is a deficient number, since it is larger than the sum of its proper divisors (2927433392).

2991071728 is a wasteful number, since it uses less digits than its factorization.

2991071728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977544 (or 3977538 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 2991071728 is about 54690.6914200214. The cubic root of 2991071728 is about 1440.8173934419.

The spelling of 2991071728 in words is "two billion, nine hundred ninety-one million, seventy-one thousand, seven hundred twenty-eight".