720755617 has 4 divisors (see below), whose sum is σ = 722236096. Its totient is φ = 719275140.

The previous prime is 720755603. The next prime is 720755621. The reversal of 720755617 is 716557027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 720755617 - 2¹¹ = 720753569 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 720755617.

It is not an unprimeable number, because it can be changed into a prime (720755657) 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, 739509 + ... + 740482.

It is an arithmetic number, because the mean of its divisors is an integer number (180559024).

Almost surely, 2^720755617 is an apocalyptic number.

It is an amenable number.

720755617 is a deficient number, since it is larger than the sum of its proper divisors (1480479).

720755617 is a wasteful number, since it uses less digits than its factorization.

720755617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480478.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 720755617 is about 26846.8921292577. The cubic root of 720755617 is about 896.5943791005.

The spelling of 720755617 in words is "seven hundred twenty million, seven hundred fifty-five thousand, six hundred seventeen".