720161755 has 8 divisors (see below), whose sum is σ = 870999552. Its totient is φ = 571592448.

The previous prime is 720161749. The next prime is 720161789. The reversal of 720161755 is 557161027.

It is a happy number.

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 720161755 - 2⁵ = 720161723 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 720161755.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 566422 + ... + 567691.

It is an arithmetic number, because the mean of its divisors is an integer number (108874944).

Almost surely, 2^720161755 is an apocalyptic number.

720161755 is a deficient number, since it is larger than the sum of its proper divisors (150837797).

720161755 is a wasteful number, since it uses less digits than its factorization.

720161755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134245.

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 720161755 is about 26835.8296871925. The cubic root of 720161755 is about 896.3480636954.

The spelling of 720161755 in words is "seven hundred twenty million, one hundred sixty-one thousand, seven hundred fifty-five".