650643840 has 640 divisors, whose sum is σ = 2914686720. Its totient is φ = 134369280.

The previous prime is 650643823. The next prime is 650643869. The reversal of 650643840 is 48346056.

650643840 is a `hidden beast` number, since 6 + 5 + 0 + 643 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 650643795 and 650643804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3991599 + ... + 3991761.

It is an arithmetic number, because the mean of its divisors is an integer number (4554198).

Almost surely, 2^650643840 is an apocalyptic number.

650643840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 650643840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1457343360).

650643840 is an abundant number, since it is smaller than the sum of its proper divisors (2264042880).

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

650643840 is a wasteful number, since it uses less digits than its factorization.

650643840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 650643840 is about 25507.7211839866. The cubic root of 650643840 is about 866.5250209010.

Adding to 650643840 its reverse (48346056), we get a palindrome (698989896).

The spelling of 650643840 in words is "six hundred fifty million, six hundred forty-three thousand, eight hundred forty".