649030986 has 48 divisors (see below), whose sum is σ = 1447173000. Its totient is φ = 210069504.

The previous prime is 649030957. The next prime is 649030999. The reversal of 649030986 is 689030946.

It can be written as a sum of positive squares in 4 ways, for example, as 609151761 + 39879225 = 24681^2 + 6315^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 618190 + ... + 619238.

Almost surely, 2^649030986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649030986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723586500).

649030986 is an abundant number, since it is smaller than the sum of its proper divisors (798142014).

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

649030986 is a wasteful number, since it uses less digits than its factorization.

649030986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 649030986 is about 25476.0865519020. The cubic root of 649030986 is about 865.8084308340.

The spelling of 649030986 in words is "six hundred forty-nine million, thirty thousand, nine hundred eighty-six".