728663526 has 20 divisors (see below), whose sum is σ = 1632746412. Its totient is φ = 242887788.

The previous prime is 728663497. The next prime is 728663543. The reversal of 728663526 is 625366827.

It is a happy number.

728663526 is a `hidden beast` number, since 7 + 2 + 8 + 6 + 635 + 2 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2248800 + ... + 2249123.

Almost surely, 2^728663526 is an apocalyptic number.

728663526 is an abundant number, since it is smaller than the sum of its proper divisors (904082886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728663526 is a wasteful number, since it uses less digits than its factorization.

728663526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4497937 (or 4497928 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 728663526 is about 26993.7682808459. The cubic root of 728663526 is about 899.8615120245.

The spelling of 728663526 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, five hundred twenty-six".