720758461 has 4 divisors (see below), whose sum is σ = 720978300. Its totient is φ = 720538624.

The previous prime is 720758443. The next prime is 720758497. The reversal of 720758461 is 164857027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164857027 = 149 ⋅1106423.

It can be written as a sum of positive squares in 2 ways, for example, as 105966436 + 614792025 = 10294^2 + 24795^2 .

It is a cyclic number.

It is not a de Polignac number, because 720758461 - 2⁹ = 720757949 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720758411) 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, 104926 + ... + 111583.

It is an arithmetic number, because the mean of its divisors is an integer number (180244575).

Almost surely, 2^720758461 is an apocalyptic number.

It is an amenable number.

720758461 is a deficient number, since it is larger than the sum of its proper divisors (219839).

720758461 is a wasteful number, since it uses less digits than its factorization.

720758461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219838.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 720758461 is about 26846.9450962302. The cubic root of 720758461 is about 896.5955583773.

The spelling of 720758461 in words is "seven hundred twenty million, seven hundred fifty-eight thousand, four hundred sixty-one".