650564640 has 288 divisors, whose sum is σ = 2462031936. Its totient is φ = 155105280.

The previous prime is 650564633. The next prime is 650564657. The reversal of 650564640 is 46465056.

It is a happy number.

650564640 is a `hidden beast` number, since 6 + 5 + 0 + 5 + 6 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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 = 650564595 and 650564604.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1060974 + ... + 1061586.

It is an arithmetic number, because the mean of its divisors is an integer number (8548722).

Almost surely, 2^650564640 is an apocalyptic number.

650564640 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 650564640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231015968).

650564640 is an abundant number, since it is smaller than the sum of its proper divisors (1811467296).

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

650564640 is a wasteful number, since it uses less digits than its factorization.

650564640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 650564640 is about 25506.1686656385. The cubic root of 650564640 is about 866.4898600535.

It can be divided in two parts, 65056 and 4640, that added together give a palindrome (69696).

The spelling of 650564640 in words is "six hundred fifty million, five hundred sixty-four thousand, six hundred forty".