68409999 has 12 divisors (see below), whose sum is σ = 112930896. Its totient is φ = 39091392.

The previous prime is 68409997. The next prime is 68410007. The reversal of 68409999 is 99990486.

It is a happy number.

It is not a de Polignac number, because 68409999 - 2¹ = 68409997 is a prime.

68409999 is a modest number, since divided by 9999 gives 6840 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68409997) 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, 542874 + ... + 542999.

It is an arithmetic number, because the mean of its divisors is an integer number (9410908).

Almost surely, 2^68409999 is an apocalyptic number.

68409999 is a deficient number, since it is larger than the sum of its proper divisors (44520897).

68409999 is a wasteful number, since it uses less digits than its factorization.

68409999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085886 (or 1085883 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 68409999 is about 8271.0337322490. The cubic root of 68409999 is about 408.9841976347.

The spelling of 68409999 in words is "sixty-eight million, four hundred nine thousand, nine hundred ninety-nine".