650221440 has 256 divisors, whose sum is σ = 2395319040. Its totient is φ = 148275200.

The previous prime is 650221427. The next prime is 650221463. The reversal of 650221440 is 44122056.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 650221440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358135 + ... + 359945.

It is an arithmetic number, because the mean of its divisors is an integer number (9356715).

Almost surely, 2^650221440 is an apocalyptic number.

650221440 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 650221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197659520).

650221440 is an abundant number, since it is smaller than the sum of its proper divisors (1745097600).

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

650221440 is a wasteful number, since it uses less digits than its factorization.

650221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 650221440 is about 25499.4399938508. The cubic root of 650221440 is about 866.3374633967.

Adding to 650221440 its reverse (44122056), we get a palindrome (694343496).

The spelling of 650221440 in words is "six hundred fifty million, two hundred twenty-one thousand, four hundred forty".