728491640 has 16 divisors (see below), whose sum is σ = 1639106280. Its totient is φ = 291396640.

The previous prime is 728491639. The next prime is 728491651. The reversal of 728491640 is 46194827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9106106 + ... + 9106185.

Almost surely, 2^728491640 is an apocalyptic number.

It is an amenable number.

728491640 is an abundant number, since it is smaller than the sum of its proper divisors (910614640).

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

728491640 is a wasteful number, since it uses less digits than its factorization.

728491640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18212302 (or 18212298 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 728491640 is about 26990.5842841536. The cubic root of 728491640 is about 899.7907497069.

The spelling of 728491640 in words is "seven hundred twenty-eight million, four hundred ninety-one thousand, six hundred forty".