68312609 has 4 divisors (see below), whose sum is σ = 68342016. Its totient is φ = 68283204.

The previous prime is 68312593. The next prime is 68312639. The reversal of 68312609 is 90621386.

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 68312609 - 2⁴ = 68312593 is a prime.

It is a super-2 number, since 2×68312609² = 9333225096773762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68312639) 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, 10889 + ... + 15974.

It is an arithmetic number, because the mean of its divisors is an integer number (17085504).

Almost surely, 2^68312609 is an apocalyptic number.

It is an amenable number.

68312609 is a deficient number, since it is larger than the sum of its proper divisors (29407).

68312609 is a wasteful number, since it uses less digits than its factorization.

68312609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29406.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 68312609 is about 8265.1442213672. The cubic root of 68312609 is about 408.7900257886.

It can be divided in two parts, 68312 and 609, that added together give a cube (68921 = 41³).

The spelling of 68312609 in words is "sixty-eight million, three hundred twelve thousand, six hundred nine".