720680869 has 4 divisors (see below), whose sum is σ = 723340480. Its totient is φ = 718021260.

The previous prime is 720680867. The next prime is 720680921. The reversal of 720680869 is 968086027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 968086027 = 2939 ⋅329393.

It is a cyclic number.

It is not a de Polignac number, because 720680869 - 2¹ = 720680867 is a prime.

It is a super-2 number, since 2×720680869² = 1038761829885190322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720680861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1329399 + ... + 1329940.

It is an arithmetic number, because the mean of its divisors is an integer number (180835120).

Almost surely, 2^720680869 is an apocalyptic number.

It is an amenable number.

720680869 is a deficient number, since it is larger than the sum of its proper divisors (2659611).

720680869 is a wasteful number, since it uses less digits than its factorization.

720680869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659610.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 720680869 is about 26845.4999767186. The cubic root of 720680869 is about 896.5633834103.

The spelling of 720680869 in words is "seven hundred twenty million, six hundred eighty thousand, eight hundred sixty-nine".