68905442 has 4 divisors (see below), whose sum is σ = 103358166. Its totient is φ = 34452720.

The previous prime is 68905427. The next prime is 68905453. The reversal of 68905442 is 24450986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 68873401 + 32041 = 8299^2 + 179^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68905396 and 68905405.

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 as a sum of consecutive naturals, namely, 17226359 + ... + 17226362.

Almost surely, 2^68905442 is an apocalyptic number.

68905442 is a deficient number, since it is larger than the sum of its proper divisors (34452724).

68905442 is a wasteful number, since it uses less digits than its factorization.

68905442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34452723.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 68905442 is about 8300.9301888403. The cubic root of 68905442 is about 409.9691469942.

The spelling of 68905442 in words is "sixty-eight million, nine hundred five thousand, four hundred forty-two".