68161687 has 16 divisors (see below), whose sum is σ = 81453600. Its totient is φ = 56304640.

The previous prime is 68161661. The next prime is 68161693. The reversal of 68161687 is 78616186.

It is a cyclic number.

It is not a de Polignac number, because 68161687 - 2¹¹ = 68159639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68161637) 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, 862 + ... + 11707.

It is an arithmetic number, because the mean of its divisors is an integer number (5090850).

Almost surely, 2^68161687 is an apocalyptic number.

68161687 is a deficient number, since it is larger than the sum of its proper divisors (13291913).

68161687 is a wasteful number, since it uses less digits than its factorization.

68161687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12626.

The product of its digits is 96768, while the sum is 43.

The square root of 68161687 is about 8256.0091448593. The cubic root of 68161687 is about 408.4887593057.

The spelling of 68161687 in words is "sixty-eight million, one hundred sixty-one thousand, six hundred eighty-seven".