68543947 has 4 divisors (see below), whose sum is σ = 68571976. Its totient is φ = 68515920.

The previous prime is 68543939. The next prime is 68543957. The reversal of 68543947 is 74934586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74934586 = 2 ⋅37467293.

It is a cyclic number.

It is not a de Polignac number, because 68543947 - 2³ = 68543939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68543897 and 68543906.

It is not an unprimeable number, because it can be changed into a prime (68543957) 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, 9954 + ... + 15367.

It is an arithmetic number, because the mean of its divisors is an integer number (17142994).

Almost surely, 2^68543947 is an apocalyptic number.

68543947 is a deficient number, since it is larger than the sum of its proper divisors (28029).

68543947 is a wasteful number, since it uses less digits than its factorization.

68543947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28028.

The product of its digits is 725760, while the sum is 46.

The square root of 68543947 is about 8279.1271882971. The cubic root of 68543947 is about 409.2509563924.

It can be divided in two parts, 6854 and 3947, that added together give a palindrome (10801).

The spelling of 68543947 in words is "sixty-eight million, five hundred forty-three thousand, nine hundred forty-seven".