68687609 has 4 divisors (see below), whose sum is σ = 68885904. Its totient is φ = 68489316.

The previous prime is 68687579. The next prime is 68687699. The reversal of 68687609 is 90678686.

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 a de Polignac number, because none of the positive numbers 2^k-68687609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68687699) 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, 98627 + ... + 99320.

It is an arithmetic number, because the mean of its divisors is an integer number (17221476).

Almost surely, 2^68687609 is an apocalyptic number.

It is an amenable number.

68687609 is a deficient number, since it is larger than the sum of its proper divisors (198295).

68687609 is a wasteful number, since it uses less digits than its factorization.

68687609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198294.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 68687609 is about 8287.7988030598. The cubic root of 68687609 is about 409.5366747074.

It can be divided in two parts, 68687 and 609, that added together give a palindrome (69296).

The spelling of 68687609 in words is "sixty-eight million, six hundred eighty-seven thousand, six hundred nine".