649539648 has 140 divisors (see below), whose sum is σ = 1945093392. Its totient is φ = 214306560.

The previous prime is 649539641. The next prime is 649539679. The reversal of 649539648 is 846935946.

649539648 is a `hidden beast` number, since 6 + 49 + 539 + 64 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 649539594 and 649539603.

It is not an unprimeable number, because it can be changed into a prime (649539641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 554103 + ... + 555273.

Almost surely, 2^649539648 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 649539648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972546696).

649539648 is an abundant number, since it is smaller than the sum of its proper divisors (1295553744).

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

649539648 is a wasteful number, since it uses less digits than its factorization.

649539648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1283 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 649539648 is about 25486.0677233660. The cubic root of 649539648 is about 866.0345570929.

The spelling of 649539648 in words is "six hundred forty-nine million, five hundred thirty-nine thousand, six hundred forty-eight".