649889000 has 64 divisors (see below), whose sum is σ = 1525502160. Its totient is φ = 259142400.

The previous prime is 649888999. The next prime is 649889011. The reversal of 649889000 is 988946.

It can be written as a sum of positive squares in 8 ways, for example, as 964324 + 648924676 = 982^2 + 25474^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396182 + ... + 397818.

Almost surely, 2^649889000 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 649889000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762751080).

649889000 is an abundant number, since it is smaller than the sum of its proper divisors (875613160).

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

649889000 is a wasteful number, since it uses less digits than its factorization.

649889000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 649889000 is about 25492.9205859195. The cubic root of 649889000 is about 866.1897935386.

The spelling of 649889000 in words is "six hundred forty-nine million, eight hundred eighty-nine thousand".