649121589528 has 64 divisors (see below), whose sum is σ = 1669126923360. Its totient is φ = 210214757376.

The previous prime is 649121589497. The next prime is 649121589547. The reversal of 649121589528 is 825985121946.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 61300 + ... + 1141052.

Almost surely, 2^649121589528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649121589528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834563461680).

649121589528 is an abundant number, since it is smaller than the sum of its proper divisors (1020005333832).

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

649121589528 is a wasteful number, since it uses less digits than its factorization.

649121589528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080476 (or 1080472 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 60.

The spelling of 649121589528 in words is "six hundred forty-nine billion, one hundred twenty-one million, five hundred eighty-nine thousand, five hundred twenty-eight".