68438687 has 4 divisors (see below), whose sum is σ = 68782800. Its totient is φ = 68094576.

The previous prime is 68438663. The next prime is 68438701. The reversal of 68438687 is 78683486.

It is a happy number.

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 68438687 - 2⁸ = 68438431 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 (68438287) 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, 171758 + ... + 172155.

It is an arithmetic number, because the mean of its divisors is an integer number (17195700).

Almost surely, 2^68438687 is an apocalyptic number.

68438687 is a deficient number, since it is larger than the sum of its proper divisors (344113).

68438687 is a wasteful number, since it uses less digits than its factorization.

68438687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344112.

The product of its digits is 1548288, while the sum is 50.

The square root of 68438687 is about 8272.7677956050. The cubic root of 68438687 is about 409.0413593515.

The spelling of 68438687 in words is "sixty-eight million, four hundred thirty-eight thousand, six hundred eighty-seven".