720505736 has 32 divisors (see below), whose sum is σ = 1404224640. Its totient is φ = 346281408.

The previous prime is 720505733. The next prime is 720505757. The reversal of 720505736 is 637505027.

It is a junction number, because it is equal to n+sod(n) for n = 720505696 and 720505705.

It is not an unprimeable number, because it can be changed into a prime (720505733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9905 + ... + 39231.

It is an arithmetic number, because the mean of its divisors is an integer number (43882020).

Almost surely, 2^720505736 is an apocalyptic number.

It is an amenable number.

720505736 is a deficient number, since it is larger than the sum of its proper divisors (683718904).

720505736 is a wasteful number, since it uses less digits than its factorization.

720505736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29453 (or 29449 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 35.

The square root of 720505736 is about 26842.2379096826. The cubic root of 720505736 is about 896.4907527622.

The spelling of 720505736 in words is "seven hundred twenty million, five hundred five thousand, seven hundred thirty-six".