720402321 has 8 divisors (see below), whose sum is σ = 986497024. Its totient is φ = 467287920.

The previous prime is 720402259. The next prime is 720402329. The reversal of 720402321 is 123204027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720402321 - 2⁶ = 720402257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720402329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3244945 + ... + 3245166.

It is an arithmetic number, because the mean of its divisors is an integer number (123312128).

Almost surely, 2^720402321 is an apocalyptic number.

It is an amenable number.

720402321 is a deficient number, since it is larger than the sum of its proper divisors (266094703).

720402321 is a wasteful number, since it uses less digits than its factorization.

720402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490151.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 720402321 is about 26840.3114922312. The cubic root of 720402321 is about 896.4478592673.

Adding to 720402321 its reverse (123204027), we get a palindrome (843606348).

The spelling of 720402321 in words is "seven hundred twenty million, four hundred two thousand, three hundred twenty-one".