68140047 has 4 divisors (see below), whose sum is σ = 90853400. Its totient is φ = 45426696.

The previous prime is 68140003. The next prime is 68140069. The reversal of 68140047 is 74004186.

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

It is not a de Polignac number, because 68140047 - 2⁶ = 68139983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68139996 and 68140023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68140087) 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, 11356672 + ... + 11356677.

It is an arithmetic number, because the mean of its divisors is an integer number (22713350).

Almost surely, 2^68140047 is an apocalyptic number.

68140047 is a deficient number, since it is larger than the sum of its proper divisors (22713353).

68140047 is a wasteful number, since it uses less digits than its factorization.

68140047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22713352.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 68140047 is about 8254.6984802596. The cubic root of 68140047 is about 408.4455256712.

The spelling of 68140047 in words is "sixty-eight million, one hundred forty thousand, forty-seven".