650629728 has 144 divisors (see below), whose sum is σ = 2143997856. Its totient is φ = 183306240.

The previous prime is 650629723. The next prime is 650629739. The reversal of 650629728 is 827926056.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650629723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144958 + ... + 149378.

It is an arithmetic number, because the mean of its divisors is an integer number (14888874).

Almost surely, 2^650629728 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 650629728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071998928).

650629728 is an abundant number, since it is smaller than the sum of its proper divisors (1493368128).

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

650629728 is a wasteful number, since it uses less digits than its factorization.

650629728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517 (or 4506 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 650629728 is about 25507.4445603632. Note that the first 3 decimals coincide. The cubic root of 650629728 is about 866.5187560862.

The spelling of 650629728 in words is "six hundred fifty million, six hundred twenty-nine thousand, seven hundred twenty-eight".