7225621328 has 30 divisors (see below), whose sum is σ = 14303913546. Its totient is φ = 3535925056.

The previous prime is 7225621309. The next prime is 7225621369. The reversal of 7225621328 is 8231265227.

It can be written as a sum of positive squares in only one way, i.e., 5825963584 + 1399657744 = 76328^2 + 37412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7225621291 and 7225621300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66875 + ... + 137562.

Almost surely, 2^7225621328 is an apocalyptic number.

It is an amenable number.

7225621328 is a deficient number, since it is larger than the sum of its proper divisors (7078292218).

7225621328 is a wasteful number, since it uses less digits than its factorization.

7225621328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204539 (or 204486 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 7225621328 is about 85003.6547920147. The cubic root of 7225621328 is about 1933.2665317651.

The spelling of 7225621328 in words is "seven billion, two hundred twenty-five million, six hundred twenty-one thousand, three hundred twenty-eight".