720680355 has 32 divisors (see below), whose sum is σ = 1348646400. Its totient is φ = 364131936.

The previous prime is 720680353. The next prime is 720680357. The reversal of 720680355 is 553086027.

It is an interprime number because it is at equal distance from previous prime (720680353) and next prime (720680357).

It is not a de Polignac number, because 720680355 - 2¹ = 720680353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720680353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137919 + ... + 143048.

It is an arithmetic number, because the mean of its divisors is an integer number (42145200).

Almost surely, 2^720680355 is an apocalyptic number.

720680355 is a deficient number, since it is larger than the sum of its proper divisors (627966045).

720680355 is a wasteful number, since it uses less digits than its factorization.

720680355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281000 (or 280994 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 720680355 is about 26845.4904034179. The cubic root of 720680355 is about 896.5631702629.

The spelling of 720680355 in words is "seven hundred twenty million, six hundred eighty thousand, three hundred fifty-five".