649389912 has 64 divisors (see below), whose sum is σ = 1700455680. Its totient is φ = 206270592.

The previous prime is 649389911. The next prime is 649389943. The reversal of 649389912 is 219983946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649389911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154138 + ... + 158294.

It is an arithmetic number, because the mean of its divisors is an integer number (26569620).

Almost surely, 2^649389912 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 649389912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850227840).

649389912 is an abundant number, since it is smaller than the sum of its proper divisors (1051065768).

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

649389912 is a wasteful number, since it uses less digits than its factorization.

649389912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472 (or 4468 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 649389912 is about 25483.1299490467. The cubic root of 649389912 is about 865.9680040520.

The spelling of 649389912 in words is "six hundred forty-nine million, three hundred eighty-nine thousand, nine hundred twelve".