68639649 has 8 divisors (see below), whose sum is σ = 98559552. Its totient is φ = 42239760.

The previous prime is 68639639. The next prime is 68639651. The reversal of 68639649 is 94693686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68639649 - 2⁸ = 68639393 is a prime.

It is a super-2 number, since 2×68639649² = 9422802829686402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68639629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879957 + ... + 880034.

It is an arithmetic number, because the mean of its divisors is an integer number (12319944).

Almost surely, 2^68639649 is an apocalyptic number.

It is an amenable number.

68639649 is a deficient number, since it is larger than the sum of its proper divisors (29919903).

68639649 is a wasteful number, since it uses less digits than its factorization.

68639649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760007.

The product of its digits is 1679616, while the sum is 51.

The square root of 68639649 is about 8284.9048878065. The cubic root of 68639649 is about 409.4413350850.

The spelling of 68639649 in words is "sixty-eight million, six hundred thirty-nine thousand, six hundred forty-nine".