720328591 has 4 divisors (see below), whose sum is σ = 731079832. Its totient is φ = 709577352.

The previous prime is 720328541. The next prime is 720328597. The reversal of 720328591 is 195823027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720328591 - 2¹⁷ = 720197519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720328591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720328597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5375520 + ... + 5375653.

It is an arithmetic number, because the mean of its divisors is an integer number (182769958).

Almost surely, 2^720328591 is an apocalyptic number.

720328591 is a deficient number, since it is larger than the sum of its proper divisors (10751241).

720328591 is a wasteful number, since it uses less digits than its factorization.

720328591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10751240.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 720328591 is about 26838.9379633398. The cubic root of 720328591 is about 896.4172757292.

The spelling of 720328591 in words is "seven hundred twenty million, three hundred twenty-eight thousand, five hundred ninety-one".