7128919980 has 144 divisors (see below), whose sum is σ = 26614695744. Its totient is φ = 1504120320.

The previous prime is 7128919979. The next prime is 7128919999. The reversal of 7128919980 is 899198217.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201231 + ... + 233990.

It is an arithmetic number, because the mean of its divisors is an integer number (184824276).

Almost surely, 2^7128919980 is an apocalyptic number.

7128919980 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7128919980 is an abundant number, since it is smaller than the sum of its proper divisors (19485775764).

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

7128919980 is a wasteful number, since it uses less digits than its factorization.

7128919980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435256 (or 435251 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 7128919980 is about 84432.9318453410. The cubic root of 7128919980 is about 1924.6033909405.

The spelling of 7128919980 in words is "seven billion, one hundred twenty-eight million, nine hundred nineteen thousand, nine hundred eighty".