720580861 has 32 divisors (see below), whose sum is σ = 983437056. Its totient is φ = 509760000.

The previous prime is 720580849. The next prime is 720580879. The reversal of 720580861 is 168085027.

It is a cyclic number.

It is not a de Polignac number, because 720580861 - 2⁷ = 720580733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720580861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720580841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55161 + ... + 66961.

It is an arithmetic number, because the mean of its divisors is an integer number (30732408).

Almost surely, 2^720580861 is an apocalyptic number.

It is an amenable number.

720580861 is a deficient number, since it is larger than the sum of its proper divisors (262856195).

720580861 is a wasteful number, since it uses less digits than its factorization.

720580861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11893.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 720580861 is about 26843.6372535467. The cubic root of 720580861 is about 896.5219098249.

It can be divided in two parts, 720 and 580861, that added together give a triangular number (581581 = T₁₀₇₈).

The spelling of 720580861 in words is "seven hundred twenty million, five hundred eighty thousand, eight hundred sixty-one".