728661250 has 40 divisors (see below), whose sum is σ = 1412969580. Its totient is φ = 281400000.

The previous prime is 728661217. The next prime is 728661301. The reversal of 728661250 is 52166827.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 88115769 + 640545481 = 9387^2 + 25309^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26200 + ... + 46300.

Almost surely, 2^728661250 is an apocalyptic number.

728661250 is a deficient number, since it is larger than the sum of its proper divisors (684308330).

728661250 is a wasteful number, since it uses less digits than its factorization.

728661250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20152 (or 20137 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 728661250 is about 26993.7261229346. The cubic root of 728661250 is about 899.8605751097.

The spelling of 728661250 in words is "seven hundred twenty-eight million, six hundred sixty-one thousand, two hundred fifty".