720404028 has 36 divisors (see below), whose sum is σ = 1821842568. Its totient is φ = 240026400.

The previous prime is 720404021. The next prime is 720404029. The reversal of 720404028 is 820404027.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 720403992 and 720404010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720404021) 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 11 ways as a sum of consecutive naturals, for example, 138678 + ... + 143778.

It is an arithmetic number, because the mean of its divisors is an integer number (50606738).

Almost surely, 2^720404028 is an apocalyptic number.

It is an amenable number.

720404028 is an abundant number, since it is smaller than the sum of its proper divisors (1101438540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720404028 is a wasteful number, since it uses less digits than its factorization.

720404028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034 (or 9029 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 720404028 is about 26840.3432913963. The cubic root of 720404028 is about 896.4485673140.

Subtracting 720404028 from its reverse (820404027), we obtain a palindrome (99999999).

The spelling of 720404028 in words is "seven hundred twenty million, four hundred four thousand, twenty-eight".