650215640 has 16 divisors (see below), whose sum is σ = 1462985280. Its totient is φ = 260086240.

The previous prime is 650215633. The next prime is 650215691. The reversal of 650215640 is 46512056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8127656 + ... + 8127735.

It is an arithmetic number, because the mean of its divisors is an integer number (91436580).

Almost surely, 2^650215640 is an apocalyptic number.

It is an amenable number.

650215640 is an abundant number, since it is smaller than the sum of its proper divisors (812769640).

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

650215640 is a wasteful number, since it uses less digits than its factorization.

650215640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16255402 (or 16255398 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 650215640 is about 25499.3262656095. The cubic root of 650215640 is about 866.3348874679.

Adding to 650215640 its reverse (46512056), we get a palindrome (696727696).

The spelling of 650215640 in words is "six hundred fifty million, two hundred fifteen thousand, six hundred forty".