68640171 has 8 divisors (see below), whose sum is σ = 91642320. Its totient is φ = 45699072.

The previous prime is 68640157. The next prime is 68640193. The reversal of 68640171 is 17104686.

It is a happy number.

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

It is not a de Polignac number, because 68640171 - 2²³ = 60251563 is a prime.

It is a super-2 number, since 2×68640171² = 9422946149818482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68640571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12570 + ... + 17183.

It is an arithmetic number, because the mean of its divisors is an integer number (11455290).

Almost surely, 2^68640171 is an apocalyptic number.

68640171 is a deficient number, since it is larger than the sum of its proper divisors (23002149).

68640171 is a wasteful number, since it uses less digits than its factorization.

68640171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30525.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 68640171 is about 8284.9363908240. The cubic root of 68640171 is about 409.4423730072.

The spelling of 68640171 in words is "sixty-eight million, six hundred forty thousand, one hundred seventy-one".