68173990 has 16 divisors (see below), whose sum is σ = 123930000. Its totient is φ = 26999200.

The previous prime is 68173967. The next prime is 68173993. The reversal of 68173990 is 9937186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68173993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32740 + ... + 34759.

It is an arithmetic number, because the mean of its divisors is an integer number (7745625).

Almost surely, 2^68173990 is an apocalyptic number.

68173990 is a deficient number, since it is larger than the sum of its proper divisors (55756010).

68173990 is a wasteful number, since it uses less digits than its factorization.

68173990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67607.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 68173990 is about 8256.7542048919. The cubic root of 68173990 is about 408.5133348656.

The spelling of 68173990 in words is "sixty-eight million, one hundred seventy-three thousand, nine hundred ninety".