7320256644 has 96 divisors (see below), whose sum is σ = 18912289536. Its totient is φ = 2191974400.

The previous prime is 7320256639. The next prime is 7320256651. The reversal of 7320256644 is 4466520237.

It is a super-2 number, since 2×7320256644² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2612044 + ... + 2614844.

It is an arithmetic number, because the mean of its divisors is an integer number (197003016).

Almost surely, 2^7320256644 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 7320256644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9456144768).

7320256644 is an abundant number, since it is smaller than the sum of its proper divisors (11592032892).

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

7320256644 is a wasteful number, since it uses less digits than its factorization.

7320256644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405 (or 3403 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The square root of 7320256644 is about 85558.4983739196. The cubic root of 7320256644 is about 1941.6700682518.

The spelling of 7320256644 in words is "seven billion, three hundred twenty million, two hundred fifty-six thousand, six hundred forty-four".