728781543 has 48 divisors (see below), whose sum is σ = 1251484416. Its totient is φ = 415160640.

The previous prime is 728781541. The next prime is 728781553. The reversal of 728781543 is 345187827.

728781543 is a `hidden beast` number, since 7 + 28 + 7 + 81 + 543 = 666.

It is not a de Polignac number, because 728781543 - 2¹ = 728781541 is a prime.

It is a super-2 number, since 2×728781543² = 1062245074834921698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728781541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 957283 + ... + 958043.

It is an arithmetic number, because the mean of its divisors is an integer number (26072592).

Almost surely, 2^728781543 is an apocalyptic number.

728781543 is a deficient number, since it is larger than the sum of its proper divisors (522702873).

728781543 is an equidigital number, since it uses as much as digits as its factorization.

728781543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346 (or 1334 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 728781543 is about 26995.9541968792. The cubic root of 728781543 is about 899.9100910185.

The spelling of 728781543 in words is "seven hundred twenty-eight million, seven hundred eighty-one thousand, five hundred forty-three".