68645638 has 4 divisors (see below), whose sum is σ = 102968460. Its totient is φ = 34322818.

The previous prime is 68645627. The next prime is 68645671. The reversal of 68645638 is 83654686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83654686 = 2 ⋅41827343.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17161408 + ... + 17161411.

It is an arithmetic number, because the mean of its divisors is an integer number (25742115).

Almost surely, 2^68645638 is an apocalyptic number.

68645638 is a deficient number, since it is larger than the sum of its proper divisors (34322822).

68645638 is a wasteful number, since it uses less digits than its factorization.

68645638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34322821.

The product of its digits is 829440, while the sum is 46.

The square root of 68645638 is about 8285.2663204027. The cubic root of 68645638 is about 409.4532430366.

The spelling of 68645638 in words is "sixty-eight million, six hundred forty-five thousand, six hundred thirty-eight".