650728 has 16 divisors (see below), whose sum is σ = 1314180. Its totient is φ = 300288.

The previous prime is 650701. The next prime is 650759. The reversal of 650728 is 827056.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 13924 = 798^2 + 118^2 .

It is a junction number, because it is equal to n+sod(n) for n = 650696 and 650705.

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, 3025 + ... + 3232.

2⁶⁵⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

650728 is an abundant number, since it is smaller than the sum of its proper divisors (663452).

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

650728 is a wasteful number, since it uses less digits than its factorization.

650728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6276 (or 6272 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 650728 is about 806.6771349183. The cubic root of 650728 is about 86.6562380614.

It can be divided in two parts, 650 and 728, that added together give a triangular number (1378 = T₅₂).

The spelling of 650728 in words is "six hundred fifty thousand, seven hundred twenty-eight".