68643634 has 8 divisors (see below), whose sum is σ = 103011948. Its totient is φ = 34306320.

The previous prime is 68643593. The next prime is 68643643. The reversal of 68643634 is 43634686.

It can be written as a sum of positive squares in 2 ways, for example, as 46881409 + 21762225 = 6847^2 + 4665^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1057 + ... + 11764.

Almost surely, 2^68643634 is an apocalyptic number.

68643634 is a deficient number, since it is larger than the sum of its proper divisors (34368314).

68643634 is a wasteful number, since it uses less digits than its factorization.

68643634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15500.

The product of its digits is 248832, while the sum is 40.

The square root of 68643634 is about 8285.1453819471. The cubic root of 68643634 is about 409.4492585528.

The spelling of 68643634 in words is "sixty-eight million, six hundred forty-three thousand, six hundred thirty-four".