649435990 has 32 divisors (see below), whose sum is σ = 1352090880. Its totient is φ = 219979104.

The previous prime is 649435961. The next prime is 649435999. The reversal of 649435990 is 99534946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649435999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50080 + ... + 61699.

It is an arithmetic number, because the mean of its divisors is an integer number (42252840).

Almost surely, 2^649435990 is an apocalyptic number.

649435990 is an abundant number, since it is smaller than the sum of its proper divisors (702654890).

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

649435990 is a wasteful number, since it uses less digits than its factorization.

649435990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111876.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 649435990 is about 25484.0340213240. The cubic root of 649435990 is about 865.9884853936.

The spelling of 649435990 in words is "six hundred forty-nine million, four hundred thirty-five thousand, nine hundred ninety".