651728 has 60 divisors (see below), whose sum is σ = 1645728. Its totient is φ = 242880.

The previous prime is 651727. The next prime is 651731. The reversal of 651728 is 827156.

651728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 651728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28325 + ... + 28347.

2⁶⁵¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822864).

651728 is an abundant number, since it is smaller than the sum of its proper divisors (994000).

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

651728 is a wasteful number, since it uses less digits than its factorization.

651728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 43 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 651728 is about 807.2967236401. The cubic root of 651728 is about 86.7006047228.

The spelling of 651728 in words is "six hundred fifty-one thousand, seven hundred twenty-eight".