7288120644 has 72 divisors (see below), whose sum is σ = 20004455520. Its totient is φ = 2058908544.

The previous prime is 7288120627. The next prime is 7288120661. The reversal of 7288120644 is 4460218827.

It is an interprime number because it is at equal distance from previous prime (7288120627) and next prime (7288120661).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 7288120596 and 7288120605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17302 + ... + 121965.

It is an arithmetic number, because the mean of its divisors is an integer number (277839660).

Almost surely, 2^7288120644 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 7288120644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10002227760).

7288120644 is an abundant number, since it is smaller than the sum of its proper divisors (12716334876).

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

7288120644 is a wasteful number, since it uses less digits than its factorization.

7288120644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139377 (or 139368 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 7288120644 is about 85370.4904753393. The cubic root of 7288120644 is about 1938.8245832612.

The spelling of 7288120644 in words is "seven billion, two hundred eighty-eight million, one hundred twenty thousand, six hundred forty-four".