720804634 has 16 divisors (see below), whose sum is σ = 1241578080. Its totient is φ = 310394160.

The previous prime is 720804631. The next prime is 720804661. The reversal of 720804634 is 436408027.

It is a self number, because there is not a number n which added to its sum of digits gives 720804634.

It is not an unprimeable number, because it can be changed into a prime (720804631) 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 7 ways as a sum of consecutive naturals, for example, 861789 + ... + 862624.

It is an arithmetic number, because the mean of its divisors is an integer number (77598630).

Almost surely, 2^720804634 is an apocalyptic number.

720804634 is a deficient number, since it is larger than the sum of its proper divisors (520773446).

720804634 is a wasteful number, since it uses less digits than its factorization.

720804634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724445.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 720804634 is about 26847.8050127008. The cubic root of 720804634 is about 896.6147037752.

The spelling of 720804634 in words is "seven hundred twenty million, eight hundred four thousand, six hundred thirty-four".