728208636 has 24 divisors (see below), whose sum is σ = 1699737984. Its totient is φ = 242652720.

The previous prime is 728208623. The next prime is 728208641. The reversal of 728208636 is 636802827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33201 + ... + 50583.

It is an arithmetic number, because the mean of its divisors is an integer number (70822416).

Almost surely, 2^728208636 is an apocalyptic number.

It is an amenable number.

728208636 is an abundant number, since it is smaller than the sum of its proper divisors (971529348).

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

728208636 is a wasteful number, since it uses less digits than its factorization.

728208636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20881 (or 20879 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 728208636 is about 26985.3411318071. The cubic root of 728208636 is about 899.6742178901.

The spelling of 728208636 in words is "seven hundred twenty-eight million, two hundred eight thousand, six hundred thirty-six".