68131387 has 4 divisors (see below), whose sum is σ = 69091056. Its totient is φ = 67171720.

The previous prime is 68131373. The next prime is 68131409. The reversal of 68131387 is 78313186.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68131387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68131337) 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, 479728 + ... + 479869.

It is an arithmetic number, because the mean of its divisors is an integer number (17272764).

Almost surely, 2^68131387 is an apocalyptic number.

68131387 is a deficient number, since it is larger than the sum of its proper divisors (959669).

68131387 is an equidigital number, since it uses as much as digits as its factorization.

68131387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959668.

The product of its digits is 24192, while the sum is 37.

The square root of 68131387 is about 8254.1739138450. The cubic root of 68131387 is about 408.4282216614.

The spelling of 68131387 in words is "sixty-eight million, one hundred thirty-one thousand, three hundred eighty-seven".