649489668 has 24 divisors (see below), whose sum is σ = 1517023872. Its totient is φ = 216275424.

The previous prime is 649489667. The next prime is 649489699. The reversal of 649489668 is 866984946.

It is not an unprimeable number, because it can be changed into a prime (649489667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15180 + ... + 39107.

It is an arithmetic number, because the mean of its divisors is an integer number (63209328).

Almost surely, 2^649489668 is an apocalyptic number.

It is an amenable number.

649489668 is an abundant number, since it is smaller than the sum of its proper divisors (867534204).

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

649489668 is a wasteful number, since it uses less digits than its factorization.

649489668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55291 (or 55289 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 60.

The square root of 649489668 is about 25485.0871687738. The cubic root of 649489668 is about 866.0123436593.

The spelling of 649489668 in words is "six hundred forty-nine million, four hundred eighty-nine thousand, six hundred sixty-eight".