720550389 has 32 divisors (see below), whose sum is σ = 1109445120. Its totient is φ = 412019712.

The previous prime is 720550367. The next prime is 720550393. The reversal of 720550389 is 983055027.

It is not a de Polignac number, because 720550389 - 2⁸ = 720550133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720550349) 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 31 ways as a sum of consecutive naturals, for example, 45499 + ... + 59255.

It is an arithmetic number, because the mean of its divisors is an integer number (34670160).

Almost surely, 2^720550389 is an apocalyptic number.

720550389 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

720550389 is a deficient number, since it is larger than the sum of its proper divisors (388894731).

720550389 is a wasteful number, since it uses less digits than its factorization.

720550389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13869.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 720550389 is about 26843.0696642541. The cubic root of 720550389 is about 896.5092722421.

The spelling of 720550389 in words is "seven hundred twenty million, five hundred fifty thousand, three hundred eighty-nine".