609728 has 28 divisors (see below), whose sum is σ = 1383792. Its totient is φ = 261120.

The previous prime is 609709. The next prime is 609743. The reversal of 609728 is 827906.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 609694 and 609703.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609728.

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, 233 + ... + 1128.

2⁶⁰⁹⁷²⁸ is an apocalyptic number.

It is an amenable number.

609728 is an abundant number, since it is smaller than the sum of its proper divisors (774064).

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

609728 is a wasteful number, since it uses less digits than its factorization.

609728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 609728 is about 780.8508180184. The cubic root of 609728 is about 84.7966534813.

The spelling of 609728 in words is "six hundred nine thousand, seven hundred twenty-eight".