720620755 has 8 divisors (see below), whose sum is σ = 878921424. Its totient is φ = 567045600.

The previous prime is 720620753. The next prime is 720620767. The reversal of 720620755 is 557026027.

It is a happy number.

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

It is not a de Polignac number, because 720620755 - 2¹ = 720620753 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 720620755.

It is not an unprimeable number, because it can be changed into a prime (720620753) 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, 1181041 + ... + 1181650.

It is an arithmetic number, because the mean of its divisors is an integer number (109865178).

Almost surely, 2^720620755 is an apocalyptic number.

720620755 is a deficient number, since it is larger than the sum of its proper divisors (158300669).

720620755 is a wasteful number, since it uses less digits than its factorization.

720620755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362757.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 720620755 is about 26844.3803243807. The cubic root of 720620755 is about 896.5384544335.

The spelling of 720620755 in words is "seven hundred twenty million, six hundred twenty thousand, seven hundred fifty-five".