68643806 has 48 divisors (see below), whose sum is σ = 134274672. Its totient is φ = 26006400.

The previous prime is 68643803. The next prime is 68643833. The reversal of 68643806 is 60834686.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68643803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39026 + ... + 40746.

It is an arithmetic number, because the mean of its divisors is an integer number (2797389).

Almost surely, 2^68643806 is an apocalyptic number.

68643806 is a deficient number, since it is larger than the sum of its proper divisors (65630866).

68643806 is a wasteful number, since it uses less digits than its factorization.

68643806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 68643806 is about 8285.1557619637. The cubic root of 68643806 is about 409.4496005375.

The spelling of 68643806 in words is "sixty-eight million, six hundred forty-three thousand, eight hundred six".