649129968 has 60 divisors (see below), whose sum is σ = 1879317960. Its totient is φ = 208914048.

The previous prime is 649129963. The next prime is 649129981. The reversal of 649129968 is 869921946.

649129968 is a `hidden beast` number, since 6 + 491 + 2 + 99 + 68 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649129963) by changing a digit.

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, 73546 + ... + 81897.

It is an arithmetic number, because the mean of its divisors is an integer number (31321966).

Almost surely, 2^649129968 is an apocalyptic number.

It is an amenable number.

649129968 is an abundant number, since it is smaller than the sum of its proper divisors (1230187992).

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

649129968 is a wasteful number, since it uses less digits than its factorization.

649129968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155486 (or 155477 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 649129968 is about 25478.0291231484. The cubic root of 649129968 is about 865.8524426484.

The spelling of 649129968 in words is "six hundred forty-nine million, one hundred twenty-nine thousand, nine hundred sixty-eight".