3991092728 has 48 divisors (see below), whose sum is σ = 9163240200. Its totient is φ = 1620440640.

The previous prime is 3991092697. The next prime is 3991092751. The reversal of 3991092728 is 8272901993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260483 + ... + 275378.

Almost surely, 2^3991092728 is an apocalyptic number.

3991092728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3991092728 is an abundant number, since it is smaller than the sum of its proper divisors (5172147472).

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

3991092728 is a wasteful number, since it uses less digits than its factorization.

3991092728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535900 (or 535889 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 3991092728 is about 63175.0957894011. The cubic root of 3991092728 is about 1586.2218918644.

The spelling of 3991092728 in words is "three billion, nine hundred ninety-one million, ninety-two thousand, seven hundred twenty-eight".