649885628 has 36 divisors (see below), whose sum is σ = 1327042080. Its totient is φ = 277667712.

The previous prime is 649885627. The next prime is 649885637. The reversal of 649885628 is 826588946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649885627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61133 + ... + 70971.

It is an arithmetic number, because the mean of its divisors is an integer number (36862280).

Almost surely, 2^649885628 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 649885628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663521040).

649885628 is an abundant number, since it is smaller than the sum of its proper divisors (677156452).

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

649885628 is a wasteful number, since it uses less digits than its factorization.

649885628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194 (or 10185 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The square root of 649885628 is about 25492.8544498257. The cubic root of 649885628 is about 866.1882954381.

The spelling of 649885628 in words is "six hundred forty-nine million, eight hundred eighty-five thousand, six hundred twenty-eight".