67691231 has 16 divisors (see below), whose sum is σ = 72817920. Its totient is φ = 62779200.

The previous prime is 67691227. The next prime is 67691257. The reversal of 67691231 is 13219676.

It is a cyclic number.

It is not a de Polignac number, because 67691231 - 2² = 67691227 is a prime.

It is a super-2 number, since 2×67691231² = 9164205508590722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67691191 and 67691200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67691201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112331 + ... + 112931.

It is an arithmetic number, because the mean of its divisors is an integer number (4551120).

Almost surely, 2^67691231 is an apocalyptic number.

67691231 is a deficient number, since it is larger than the sum of its proper divisors (5126689).

67691231 is a wasteful number, since it uses less digits than its factorization.

67691231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 13608, while the sum is 35.

The square root of 67691231 is about 8227.4680795491. The cubic root of 67691231 is about 407.5467842456.

It can be divided in two parts, 6769 and 1231, that added together give a cube (8000 = 20³).

The spelling of 67691231 in words is "sixty-seven million, six hundred ninety-one thousand, two hundred thirty-one".