7128558144 has 112 divisors (see below), whose sum is σ = 21149462400. Its totient is φ = 2354323968.

The previous prime is 7128558139. The next prime is 7128558163. The reversal of 7128558144 is 4418558217.

7128558144 is a `hidden beast` number, since 7 + 1 + 28 + 5 + 581 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 7128558144.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169429 + ... + 207275.

Almost surely, 2^7128558144 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 7128558144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10574731200).

7128558144 is an abundant number, since it is smaller than the sum of its proper divisors (14020904256).

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

7128558144 is a wasteful number, since it uses less digits than its factorization.

7128558144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37977 (or 37961 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 7128558144 is about 84430.7890760237. The cubic root of 7128558144 is about 1924.5708286180.

The spelling of 7128558144 in words is "seven billion, one hundred twenty-eight million, five hundred fifty-eight thousand, one hundred forty-four".