7321540356 has 81 divisors (see below), whose sum is σ = 20058655071. Its totient is φ = 2250728064.

The previous prime is 7321540339. The next prime is 7321540367. The reversal of 7321540356 is 6530451237.

The square root of 7321540356 is 85566.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2427138756 + 4894401600 = 49266^2 + 69960^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 7321540356.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6673600 + ... + 6674696.

Almost surely, 2^7321540356 is an apocalyptic number.

7321540356 is the 85566-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7321540356

7321540356 is an abundant number, since it is smaller than the sum of its proper divisors (12737114715).

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

7321540356 is a wasteful number, since it uses less digits than its factorization.

7321540356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The cubic root of 7321540356 is about 1941.7835615167.

Multiplying 7321540356 by its sum of digits (36), we get a square (263575452816 = 513396²).

7321540356 divided by its sum of digits (36) gives a square (203376121 = 14261²).

The spelling of 7321540356 in words is "seven billion, three hundred twenty-one million, five hundred forty thousand, three hundred fifty-six".