720621331 has 8 divisors (see below), whose sum is σ = 731217600. Its totient is φ = 710062080.

The previous prime is 720621329. The next prime is 720621359. The reversal of 720621331 is 133126027.

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

It is a cyclic number.

It is not a de Polignac number, because 720621331 - 2¹ = 720621329 is a prime.

It is a super-2 number, since 2×720621331² = 1038590205384423122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720621296 and 720621305.

It is not an unprimeable number, because it can be changed into a prime (720621431) 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, 31251 + ... + 49171.

It is an arithmetic number, because the mean of its divisors is an integer number (91402200).

Almost surely, 2^720621331 is an apocalyptic number.

720621331 is a deficient number, since it is larger than the sum of its proper divisors (10596269).

720621331 is a wasteful number, since it uses less digits than its factorization.

720621331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18509.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 720621331 is about 26844.3910528810. The cubic root of 720621331 is about 896.5386933044.

Adding to 720621331 its reverse (133126027), we get a palindrome (853747358).

The spelling of 720621331 in words is "seven hundred twenty million, six hundred twenty-one thousand, three hundred thirty-one".