68902905 has 8 divisors (see below), whose sum is σ = 110244672. Its totient is φ = 36748208.

The previous prime is 68902903. The next prime is 68902909. The reversal of 68902905 is 50920986.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 68902905 - 2¹ = 68902903 is a prime.

It is a super-2 number, since 2×68902905² = 9495220634878050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68902903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296749 + ... + 2296778.

It is an arithmetic number, because the mean of its divisors is an integer number (13780584).

Almost surely, 2^68902905 is an apocalyptic number.

It is an amenable number.

68902905 is a deficient number, since it is larger than the sum of its proper divisors (41341767).

68902905 is a wasteful number, since it uses less digits than its factorization.

68902905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593535.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 68902905 is about 8300.7773732344. Note that the first 3 decimals coincide. The cubic root of 68902905 is about 409.9641154396.

The spelling of 68902905 in words is "sixty-eight million, nine hundred two thousand, nine hundred five".