68036409 has 16 divisors (see below), whose sum is σ = 115194240. Its totient is φ = 38877840.

The previous prime is 68036399. The next prime is 68036429. The reversal of 68036409 is 90463086.

68036409 is a `hidden beast` number, since 6 + 8 + 0 + 3 + 640 + 9 = 666.

It is not a de Polignac number, because 68036409 - 2⁴ = 68036393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68036429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179802 + ... + 180179.

It is an arithmetic number, because the mean of its divisors is an integer number (7199640).

Almost surely, 2^68036409 is an apocalyptic number.

It is an amenable number.

68036409 is a deficient number, since it is larger than the sum of its proper divisors (47157831).

68036409 is a wasteful number, since it uses less digits than its factorization.

68036409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359997 (or 359991 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 68036409 is about 8248.4185757029. The cubic root of 68036409 is about 408.2383447336.

The spelling of 68036409 in words is "sixty-eight million, thirty-six thousand, four hundred nine".