746720321 has 2 divisors, whose sum is σ = 746720322. Its totient is φ = 746720320.

The previous prime is 746720297. The next prime is 746720341. The reversal of 746720321 is 123027647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510760000 + 235960321 = 22600^2 + 15361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-746720321 is a prime.

It is not a weakly prime, because it can be changed into another prime (746720341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373360160 + 373360161.

It is an arithmetic number, because the mean of its divisors is an integer number (373360161).

Almost surely, 2^746720321 is an apocalyptic number.

It is an amenable number.

746720321 is a deficient number, since it is larger than the sum of its proper divisors (1).

746720321 is an equidigital number, since it uses as much as digits as its factorization.

746720321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 746720321 is about 27326.1837986939. The cubic root of 746720321 is about 907.2340119058.

Adding to 746720321 its reverse (123027647), we get a palindrome (869747968).

The spelling of 746720321 in words is "seven hundred forty-six million, seven hundred twenty thousand, three hundred twenty-one".