68112009 has 45 divisors (see below), whose sum is σ = 119269821. Its totient is φ = 38624040.

The previous prime is 68112007. The next prime is 68112061. The reversal of 68112009 is 90021186.

The square root of 68112009 is 8253.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 68112009 - 2¹ = 68112007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (68112001) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 519874 + ... + 520004.

Almost surely, 2^68112009 is an apocalyptic number.

68112009 is the 8253-rd square number.

68112009 is the 4127-th centered octagonal number.

It is an amenable number.

68112009 is a deficient number, since it is larger than the sum of its proper divisors (51157812).

68112009 is an equidigital number, since it uses as much as digits as its factorization.

68112009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The cubic root of 68112009 is about 408.3894961298.

The spelling of 68112009 in words is "sixty-eight million, one hundred twelve thousand, nine".