731072322 has 18 divisors (see below), whose sum is σ = 1584238617. Its totient is φ = 243652536.

The previous prime is 731072317. The next prime is 731072347. The reversal of 731072322 is 223270137.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 642166281 + 88906041 = 25341^2 + 9429^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=19119.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 111528 + ... + 117900.

Almost surely, 2^731072322 is an apocalyptic number.

731072322 is an abundant number, since it is smaller than the sum of its proper divisors (853166295).

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

731072322 is an frugal number, since it uses more digits than its factorization.

731072322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12754 (or 6378 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 731072322 is about 27038.3490990112. The cubic root of 731072322 is about 900.8520005918.

Multiplying 731072322 by its product of nonzero digits (3528), we get a square (2579223152016 = 1605996²).

The spelling of 731072322 in words is "seven hundred thirty-one million, seventy-two thousand, three hundred twenty-two".