650644990 has 16 divisors (see below), whose sum is σ = 1199726640. Its totient is φ = 253910080.

The previous prime is 650644919. The next prime is 650644991. The reversal of 650644990 is 99446056.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650644991) 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, 793060 + ... + 793879.

It is an arithmetic number, because the mean of its divisors is an integer number (74982915).

Almost surely, 2^650644990 is an apocalyptic number.

650644990 is a deficient number, since it is larger than the sum of its proper divisors (549081650).

650644990 is a wasteful number, since it uses less digits than its factorization.

650644990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586987.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 650644990 is about 25507.7437261707. The cubic root of 650644990 is about 866.5255314226.

The spelling of 650644990 in words is "six hundred fifty million, six hundred forty-four thousand, nine hundred ninety".