728504401 has 4 divisors (see below), whose sum is σ = 729903204. Its totient is φ = 727105600.

The previous prime is 728504393. The next prime is 728504407. The reversal of 728504401 is 104405827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186732225 + 541772176 = 13665^2 + 23276^2 .

It is a cyclic number.

It is not a de Polignac number, because 728504401 - 2³ = 728504393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728504407) 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 3 ways as a sum of consecutive naturals, for example, 698620 + ... + 699661.

It is an arithmetic number, because the mean of its divisors is an integer number (182475801).

Almost surely, 2^728504401 is an apocalyptic number.

It is an amenable number.

728504401 is a deficient number, since it is larger than the sum of its proper divisors (1398803).

728504401 is a wasteful number, since it uses less digits than its factorization.

728504401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398802.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 728504401 is about 26990.8206803721. The cubic root of 728504401 is about 899.7960035593.

The spelling of 728504401 in words is "seven hundred twenty-eight million, five hundred four thousand, four hundred one".