865728650 has 12 divisors (see below), whose sum is σ = 1610255382. Its totient is φ = 346291440.

The previous prime is 865728637. The next prime is 865728709. The reversal of 865728650 is 56827568.

It can be written as a sum of positive squares in 3 ways, for example, as 822943969 + 42784681 = 28687^2 + 6541^2 .

It is a junction number, because it is equal to n+sod(n) for n = 865728595 and 865728604.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8657237 + ... + 8657336.

Almost surely, 2^865728650 is an apocalyptic number.

865728650 is a deficient number, since it is larger than the sum of its proper divisors (744526732).

865728650 is a wasteful number, since it uses less digits than its factorization.

865728650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17314585 (or 17314580 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 865728650 is about 29423.2671537340. The cubic root of 865728650 is about 953.0754072916.

The spelling of 865728650 in words is "eight hundred sixty-five million, seven hundred twenty-eight thousand, six hundred fifty".