728187481 has 24 divisors (see below), whose sum is σ = 859295520. Its totient is φ = 615226752.

The previous prime is 728187457. The next prime is 728187487. The reversal of 728187481 is 184781827.

728187481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728187481 - 2¹¹ = 728185433 is a prime.

It is a super-2 number, since 2×728187481² = 1060514014970250722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728187487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1921150 + ... + 1921528.

It is an arithmetic number, because the mean of its divisors is an integer number (35803980).

Almost surely, 2^728187481 is an apocalyptic number.

It is an amenable number.

728187481 is a deficient number, since it is larger than the sum of its proper divisors (131108039).

728187481 is a wasteful number, since it uses less digits than its factorization.

728187481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 846 counting only the distinct ones).

The product of its digits is 200704, while the sum is 46.

The square root of 728187481 is about 26984.9491568911. The cubic root of 728187481 is about 899.6655057383.

The spelling of 728187481 in words is "seven hundred twenty-eight million, one hundred eighty-seven thousand, four hundred eighty-one".