68208631 has 4 divisors (see below), whose sum is σ = 68225200. Its totient is φ = 68192064.

The previous prime is 68208629. The next prime is 68208677. The reversal of 68208631 is 13680286.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68208631 - 2¹ = 68208629 is a prime.

It is a super-2 number, since 2×68208631² = 9304834685788322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68208611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3175 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (17056300).

Almost surely, 2^68208631 is an apocalyptic number.

68208631 is a deficient number, since it is larger than the sum of its proper divisors (16569).

68208631 is an equidigital number, since it uses as much as digits as its factorization.

68208631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16568.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 68208631 is about 8258.8516756266. The cubic root of 68208631 is about 408.5825152780.

It can be divided in two parts, 6820 and 8631, that added together give a palindrome (15451).

The spelling of 68208631 in words is "sixty-eight million, two hundred eight thousand, six hundred thirty-one".