4891591648 has 24 divisors (see below), whose sum is σ = 10137181320. Its totient is φ = 2317069440.

The previous prime is 4891591613. The next prime is 4891591651. The reversal of 4891591648 is 8461951984.

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, 4022083 + ... + 4023298.

It is an arithmetic number, because the mean of its divisors is an integer number (422382555).

Almost surely, 2^4891591648 is an apocalyptic number.

It is an amenable number.

4891591648 is an abundant number, since it is smaller than the sum of its proper divisors (5245589672).

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

4891591648 is a wasteful number, since it uses less digits than its factorization.

4891591648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045410 (or 8045402 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 55.

The square root of 4891591648 is about 69939.9145552809. The cubic root of 4891591648 is about 1697.5271599698.

The spelling of 4891591648 in words is "four billion, eight hundred ninety-one million, five hundred ninety-one thousand, six hundred forty-eight".