7128639496 has 96 divisors (see below), whose sum is σ = 15338597400. Its totient is φ = 3100697600.

The previous prime is 7128639487. The next prime is 7128639499. The reversal of 7128639496 is 6949368217.

It can be written as a sum of positive squares in 4 ways, for example, as 6679792900 + 448846596 = 81730^2 + 21186^2 .

It is a super-2 number, since 2×7128639496² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7128639499) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2101770 + ... + 2105158.

Almost surely, 2^7128639496 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 7128639496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7669298700).

7128639496 is an abundant number, since it is smaller than the sum of its proper divisors (8209957904).

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

7128639496 is a wasteful number, since it uses less digits than its factorization.

7128639496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511 (or 3496 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 7128639496 is about 84431.2708420287. The cubic root of 7128639496 is about 1924.5781497381.

The spelling of 7128639496 in words is "seven billion, one hundred twenty-eight million, six hundred thirty-nine thousand, four hundred ninety-six".