68687573 has 4 divisors (see below), whose sum is σ = 71056140. Its totient is φ = 66319008.

The previous prime is 68687561. The next prime is 68687579. The reversal of 68687573 is 37578686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37578686 = 2 ⋅18789343.

It can be written as a sum of positive squares in 2 ways, for example, as 59089969 + 9597604 = 7687^2 + 3098^2 .

It is a cyclic number.

It is not a de Polignac number, because 68687573 - 2¹² = 68683477 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 (68687579) 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 3 ways as a sum of consecutive naturals, for example, 1184240 + ... + 1184297.

It is an arithmetic number, because the mean of its divisors is an integer number (17764035).

Almost surely, 2^68687573 is an apocalyptic number.

It is an amenable number.

68687573 is a deficient number, since it is larger than the sum of its proper divisors (2368567).

68687573 is a wasteful number, since it uses less digits than its factorization.

68687573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368566.

The product of its digits is 1693440, while the sum is 50.

The square root of 68687573 is about 8287.7966311922. The cubic root of 68687573 is about 409.5366031597.

It can be divided in two parts, 6868 and 7573, that added together give a palindrome (14441).

The spelling of 68687573 in words is "sixty-eight million, six hundred eighty-seven thousand, five hundred seventy-three".