68409189 has 12 divisors (see below), whose sum is σ = 101484396. Its totient is φ = 44373312.

The previous prime is 68409179. The next prime is 68409221. The reversal of 68409189 is 98190486.

68409189 is a `hidden beast` number, since 68 + 409 + 189 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52272900 + 16136289 = 7230^2 + 4017^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68409189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68409109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102384 + ... + 103049.

It is an arithmetic number, because the mean of its divisors is an integer number (8457033).

Almost surely, 2^68409189 is an apocalyptic number.

It is an amenable number.

68409189 is a deficient number, since it is larger than the sum of its proper divisors (33075207).

68409189 is a wasteful number, since it uses less digits than its factorization.

68409189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205476 (or 205473 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 68409189 is about 8270.9847660360. The cubic root of 68409189 is about 408.9825834530.

The spelling of 68409189 in words is "sixty-eight million, four hundred nine thousand, one hundred eighty-nine".