68640173 has 16 divisors (see below), whose sum is σ = 80123904. Its totient is φ = 57588720.

The previous prime is 68640157. The next prime is 68640193. The reversal of 68640173 is 37104686.

It is not a de Polignac number, because 68640173 - 2⁴ = 68640157 is a prime.

It is a super-2 number, since 2×68640173² = 9422946698939858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68640133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82586 + ... + 83412.

It is an arithmetic number, because the mean of its divisors is an integer number (5007744).

Almost surely, 2^68640173 is an apocalyptic number.

It is an amenable number.

68640173 is a deficient number, since it is larger than the sum of its proper divisors (11483731).

68640173 is a wasteful number, since it uses less digits than its factorization.

68640173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 68640173 is about 8284.9365115250. The cubic root of 68640173 is about 409.4423769839.

The spelling of 68640173 in words is "sixty-eight million, six hundred forty thousand, one hundred seventy-three".