728710020 has 60 divisors (see below), whose sum is σ = 2285995404. Its totient is φ = 194322240.

The previous prime is 728710019. The next prime is 728710027. The reversal of 728710020 is 20017827.

It can be written as a sum of positive squares in 2 ways, for example, as 136469124 + 592240896 = 11682^2 + 24336^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (728710027) 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 19 ways as a sum of consecutive naturals, for example, 223291 + ... + 226530.

Almost surely, 2^728710020 is an apocalyptic number.

It is an amenable number.

728710020 is an abundant number, since it is smaller than the sum of its proper divisors (1557285384).

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

728710020 is a wasteful number, since it uses less digits than its factorization.

728710020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449842 (or 449831 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 728710020 is about 26994.6294658771. The cubic root of 728710020 is about 899.8806508405.

Adding to 728710020 its reverse (20017827), we get a palindrome (748727847).

The spelling of 728710020 in words is "seven hundred twenty-eight million, seven hundred ten thousand, twenty".