720564842 has 8 divisors (see below), whose sum is σ = 1081756836. Its totient is φ = 359979232.

The previous prime is 720564841. The next prime is 720564847. The reversal of 720564842 is 248465027.

It can be written as a sum of positive squares in 2 ways, for example, as 689640121 + 30924721 = 26261^2 + 5561^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 720564796 and 720564805.

It is not an unprimeable number, because it can be changed into a prime (720564841) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 148613 + ... + 153384.

Almost surely, 2^720564842 is an apocalyptic number.

720564842 is a deficient number, since it is larger than the sum of its proper divisors (361191994).

720564842 is a wasteful number, since it uses less digits than its factorization.

720564842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303192.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 720564842 is about 26843.3388757807. The cubic root of 720564842 is about 896.5152663461.

The spelling of 720564842 in words is "seven hundred twenty million, five hundred sixty-four thousand, eight hundred forty-two".