68831691 has 16 divisors (see below), whose sum is σ = 99437184. Its totient is φ = 42182784.

The previous prime is 68831681. The next prime is 68831717. The reversal of 68831691 is 19613886.

It is not a de Polignac number, because 68831691 - 2⁹ = 68831179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68831671) 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, 13501 + ... + 17886.

It is an arithmetic number, because the mean of its divisors is an integer number (6214824).

Almost surely, 2^68831691 is an apocalyptic number.

68831691 is a deficient number, since it is larger than the sum of its proper divisors (30605493).

68831691 is a wasteful number, since it uses less digits than its factorization.

68831691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31450.

The product of its digits is 62208, while the sum is 42.

The square root of 68831691 is about 8296.4866660533. The cubic root of 68831691 is about 409.8228284675.

The spelling of 68831691 in words is "sixty-eight million, eight hundred thirty-one thousand, six hundred ninety-one".