1322720730 has 24 divisors (see below), whose sum is σ = 3439074132. Its totient is φ = 352725504.

The previous prime is 1322720723. The next prime is 1322720743. The reversal of 1322720730 is 370272231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1194600969 + 128119761 = 34563^2 + 11319^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1322720694 and 1322720703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7348359 + ... + 7348538.

Almost surely, 2^1322720730 is an apocalyptic number.

1322720730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1322720730 is an abundant number, since it is smaller than the sum of its proper divisors (2116353402).

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

1322720730 is a wasteful number, since it uses less digits than its factorization.

1322720730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14696910 (or 14696907 counting only the distinct ones).

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

The square root of 1322720730 is about 36369.2277894376. The cubic root of 1322720730 is about 1097.7144638595.

Adding to 1322720730 its reverse (370272231), we get a palindrome (1692992961).

The spelling of 1322720730 in words is "one billion, three hundred twenty-two million, seven hundred twenty thousand, seven hundred thirty".