68542549 has 8 divisors (see below), whose sum is σ = 69471000. Its totient is φ = 67617792.

The previous prime is 68542531. The next prime is 68542577. The reversal of 68542549 is 94524586.

It can be written as a sum of positive squares in 4 ways, for example, as 232324 + 68310225 = 482^2 + 8265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68542549 - 2⁷ = 68542421 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 (68542349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73317 + ... + 74245.

It is an arithmetic number, because the mean of its divisors is an integer number (8683875).

Almost surely, 2^68542549 is an apocalyptic number.

It is an amenable number.

68542549 is a deficient number, since it is larger than the sum of its proper divisors (928451).

68542549 is an equidigital number, since it uses as much as digits as its factorization.

68542549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its digits is 345600, while the sum is 43.

The square root of 68542549 is about 8279.0427586769. The cubic root of 68542549 is about 409.2481740571.

It can be divided in two parts, 685 and 42549, that added together give a palindrome (43234).

The spelling of 68542549 in words is "sixty-eight million, five hundred forty-two thousand, five hundred forty-nine".