68205138 has 32 divisors (see below), whose sum is σ = 140507136. Its totient is φ = 22059408.

The previous prime is 68205127. The next prime is 68205191. The reversal of 68205138 is 83150286.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 68205099 and 68205108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42295 + ... + 43877.

It is an arithmetic number, because the mean of its divisors is an integer number (4390848).

Almost surely, 2^68205138 is an apocalyptic number.

68205138 is an abundant number, since it is smaller than the sum of its proper divisors (72301998).

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

68205138 is a wasteful number, since it uses less digits than its factorization.

68205138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 68205138 is about 8258.6402028421. The cubic root of 68205138 is about 408.5755405835.

The spelling of 68205138 in words is "sixty-eight million, two hundred five thousand, one hundred thirty-eight".