649056668 has 36 divisors (see below), whose sum is σ = 1302315840. Its totient is φ = 281938176.

The previous prime is 649056649. The next prime is 649056673. The reversal of 649056668 is 866650946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16748 + ... + 39731.

It is an arithmetic number, because the mean of its divisors is an integer number (36175440).

Almost surely, 2^649056668 is an apocalyptic number.

649056668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

649056668 is an abundant number, since it is smaller than the sum of its proper divisors (653259172).

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

649056668 is a wasteful number, since it uses less digits than its factorization.

649056668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56526 (or 56511 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 50.

The square root of 649056668 is about 25476.5905882243. The cubic root of 649056668 is about 865.8198506272.

The spelling of 649056668 in words is "six hundred forty-nine million, fifty-six thousand, six hundred sixty-eight".