720779945 has 8 divisors (see below), whose sum is σ = 865289544. Its totient is φ = 576388224.

The previous prime is 720779933. The next prime is 720779951. The reversal of 720779945 is 549977027.

It can be written as a sum of positive squares in 4 ways, for example, as 1038361 + 719741584 = 1019^2 + 26828^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720779945 - 2⁴ = 720779929 is a prime.

It is a super-2 number, since 2×720779945² = 1039047458228406050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720779893 and 720779902.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15404 + ... + 40973.

It is an arithmetic number, because the mean of its divisors is an integer number (108161193).

Almost surely, 2^720779945 is an apocalyptic number.

It is an amenable number.

720779945 is a deficient number, since it is larger than the sum of its proper divisors (144509599).

720779945 is a wasteful number, since it uses less digits than its factorization.

720779945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58939.

The product of its (nonzero) digits is 1111320, while the sum is 50.

The square root of 720779945 is about 26847.3452132608. The cubic root of 720779945 is about 896.6044667096.

The spelling of 720779945 in words is "seven hundred twenty million, seven hundred seventy-nine thousand, nine hundred forty-five".