728421525481 has 16 divisors (see below), whose sum is σ = 795218376960. Its totient is φ = 663180336000.

The previous prime is 728421525421. The next prime is 728421525487. The reversal of 728421525481 is 184525124827.

It is not a de Polignac number, because 728421525481 - 2¹¹ = 728421523433 is a prime.

It is a super-2 number, since 2×728421525481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728421525487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606606 + ... + 1350856.

It is an arithmetic number, because the mean of its divisors is an integer number (49701148560).

Almost surely, 2^728421525481 is an apocalyptic number.

It is an amenable number.

728421525481 is a deficient number, since it is larger than the sum of its proper divisors (66796851479).

728421525481 is a wasteful number, since it uses less digits than its factorization.

728421525481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745296.

The product of its digits is 1433600, while the sum is 49.

The spelling of 728421525481 in words is "seven hundred twenty-eight billion, four hundred twenty-one million, five hundred twenty-five thousand, four hundred eighty-one".