720380881 has 12 divisors (see below), whose sum is σ = 794719156. Its totient is φ = 652497120.

The previous prime is 720380803. The next prime is 720380887. The reversal of 720380881 is 188083027.

It can be written as a sum of positive squares in 2 ways, for example, as 91374481 + 629006400 = 9559^2 + 25080^2 .

It is not a de Polignac number, because 720380881 - 2⁷ = 720380753 is a prime.

It is a super-2 number, since 2×720380881² = 1037897227420672322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 720380881.

It is not an unprimeable number, because it can be changed into a prime (720380887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22771 + ... + 44263.

Almost surely, 2^720380881 is an apocalyptic number.

It is an amenable number.

720380881 is a deficient number, since it is larger than the sum of its proper divisors (74338275).

720380881 is a wasteful number, since it uses less digits than its factorization.

720380881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21792 (or 21781 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 720380881 is about 26839.9120900200. The cubic root of 720380881 is about 896.4389660734.

The spelling of 720380881 in words is "seven hundred twenty million, three hundred eighty thousand, eight hundred eighty-one".