68542403 has 4 divisors (see below), whose sum is σ = 70000800. Its totient is φ = 67084008.

The previous prime is 68542393. The next prime is 68542417. The reversal of 68542403 is 30424586.

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 68542403 - 2⁶ = 68542339 is a prime.

It is a super-2 number, since 2×68542403² = 9396122018028818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68542403.

It is not an unprimeable number, because it can be changed into a prime (68542433) 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, 729128 + ... + 729221.

It is an arithmetic number, because the mean of its divisors is an integer number (17500200).

Almost surely, 2^68542403 is an apocalyptic number.

68542403 is a deficient number, since it is larger than the sum of its proper divisors (1458397).

68542403 is a wasteful number, since it uses less digits than its factorization.

68542403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458396.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 68542403 is about 8279.0339412277. The cubic root of 68542403 is about 409.2478834820.

Adding to 68542403 its reverse (30424586), we get a palindrome (98966989).

The spelling of 68542403 in words is "sixty-eight million, five hundred forty-two thousand, four hundred three".