728445481 has 4 divisors (see below), whose sum is σ = 729038464. Its totient is φ = 727852500.

The previous prime is 728445479. The next prime is 728445511. The reversal of 728445481 is 184544827.

728445481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184544827 = 3559 ⋅51853.

It is a cyclic number.

It is not a de Polignac number, because 728445481 - 2¹ = 728445479 is a prime.

It is a super-2 number, since 2×728445481² = 1061265637578642722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728445881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294645 + ... + 297106.

It is an arithmetic number, because the mean of its divisors is an integer number (182259616).

Almost surely, 2^728445481 is an apocalyptic number.

It is an amenable number.

728445481 is a deficient number, since it is larger than the sum of its proper divisors (592983).

728445481 is a wasteful number, since it uses less digits than its factorization.

728445481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592982.

The product of its digits is 286720, while the sum is 43.

The square root of 728445481 is about 26989.7291761144. The cubic root of 728445481 is about 899.7717449963.

The spelling of 728445481 in words is "seven hundred twenty-eight million, four hundred forty-five thousand, four hundred eighty-one".