5478947991 has 24 divisors (see below), whose sum is σ = 8642125440. Its totient is φ = 3317254800.

The previous prime is 5478947927. The next prime is 5478947993. The reversal of 5478947991 is 1997498745.

5478947991 is a `hidden beast` number, since 5 + 4 + 78 + 9 + 479 + 91 = 666.

It is not a de Polignac number, because 5478947991 - 2⁶ = 5478947927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5478947993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73726 + ... + 128036.

It is an arithmetic number, because the mean of its divisors is an integer number (360088560).

Almost surely, 2^5478947991 is an apocalyptic number.

5478947991 is a deficient number, since it is larger than the sum of its proper divisors (3163177449).

5478947991 is a wasteful number, since it uses less digits than its factorization.

5478947991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55347 (or 55344 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The square root of 5478947991 is about 74019.9161780125. The cubic root of 5478947991 is about 1762.9191388261.

The spelling of 5478947991 in words is "five billion, four hundred seventy-eight million, nine hundred forty-seven thousand, nine hundred ninety-one".