650416640 has 80 divisors (see below), whose sum is σ = 1613434680. Its totient is φ = 251166720.

The previous prime is 650416639. The next prime is 650416643. The reversal of 650416640 is 46614056.

It can be written as a sum of positive squares in 4 ways, for example, as 380406016 + 270010624 = 19504^2 + 16432^2 .

It is a tau number, because it is divible by the number of its divisors (80).

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 = 650416597 and 650416606.

It is not an unprimeable number, because it can be changed into a prime (650416643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69860 + ... + 78620.

Almost surely, 2^650416640 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 650416640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806717340).

650416640 is an abundant number, since it is smaller than the sum of its proper divisors (963018040).

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

650416640 is an equidigital number, since it uses as much as digits as its factorization.

650416640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8813 (or 8797 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 650416640 is about 25503.2672416693. The cubic root of 650416640 is about 866.4241477900.

The spelling of 650416640 in words is "six hundred fifty million, four hundred sixteen thousand, six hundred forty".