68013887 has 4 divisors (see below), whose sum is σ = 68674320. Its totient is φ = 67353456.

The previous prime is 68013877. The next prime is 68013899. The reversal of 68013887 is 78831086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68013887 - 2⁴ = 68013871 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 (68013817) 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, 330062 + ... + 330267.

It is an arithmetic number, because the mean of its divisors is an integer number (17168580).

Almost surely, 2^68013887 is an apocalyptic number.

68013887 is a deficient number, since it is larger than the sum of its proper divisors (660433).

68013887 is a wasteful number, since it uses less digits than its factorization.

68013887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660432.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 68013887 is about 8247.0532313063. The cubic root of 68013887 is about 408.1932935674.

The spelling of 68013887 in words is "sixty-eight million, thirteen thousand, eight hundred eighty-seven".