68388631 has 4 divisors (see below), whose sum is σ = 68405992. Its totient is φ = 68371272.

The previous prime is 68388623. The next prime is 68388647. The reversal of 68388631 is 13688386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13688386 = 2 ⋅6844193.

It is a cyclic number.

It is not a de Polignac number, because 68388631 - 2³ = 68388623 is a prime.

It is a super-2 number, since 2×68388631² = 9354009700108322, 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 (68388031) 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, 385 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (17101498).

Almost surely, 2^68388631 is an apocalyptic number.

68388631 is a deficient number, since it is larger than the sum of its proper divisors (17361).

68388631 is a wasteful number, since it uses less digits than its factorization.

68388631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17360.

The product of its digits is 165888, while the sum is 43.

The square root of 68388631 is about 8269.7418944003. The cubic root of 68388631 is about 408.9416108564.

The spelling of 68388631 in words is "sixty-eight million, three hundred eighty-eight thousand, six hundred thirty-one".