720072617 has 4 divisors (see below), whose sum is σ = 785533776. Its totient is φ = 654611460.

The previous prime is 720072607. The next prime is 720072637. The reversal of 720072617 is 716270027.

It is a happy number.

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 720072617 - 2⁸ = 720072361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720072607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32730563 + ... + 32730584.

It is an arithmetic number, because the mean of its divisors is an integer number (196383444).

Almost surely, 2^720072617 is an apocalyptic number.

It is an amenable number.

720072617 is a deficient number, since it is larger than the sum of its proper divisors (65461159).

720072617 is a wasteful number, since it uses less digits than its factorization.

720072617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65461158.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 720072617 is about 26834.1688337835. The cubic root of 720072617 is about 896.3110803511.

The spelling of 720072617 in words is "seven hundred twenty million, seventy-two thousand, six hundred seventeen".