68543457 has 4 divisors (see below), whose sum is σ = 91391280. Its totient is φ = 45695636.

The previous prime is 68543417. The next prime is 68543459. The reversal of 68543457 is 75434586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68543457 - 2¹⁰ = 68542433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68543459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11423907 + ... + 11423912.

It is an arithmetic number, because the mean of its divisors is an integer number (22847820).

Almost surely, 2^68543457 is an apocalyptic number.

It is an amenable number.

68543457 is a deficient number, since it is larger than the sum of its proper divisors (22847823).

68543457 is a wasteful number, since it uses less digits than its factorization.

68543457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22847822.

The product of its digits is 403200, while the sum is 42.

The square root of 68543457 is about 8279.0975957528. The cubic root of 68543457 is about 409.2499811862.

The spelling of 68543457 in words is "sixty-eight million, five hundred forty-three thousand, four hundred fifty-seven".