68911209 has 16 divisors (see below), whose sum is σ = 102498240. Its totient is φ = 45757440.

The previous prime is 68911207. The next prime is 68911211. The reversal of 68911209 is 90211986.

It is an interprime number because it is at equal distance from previous prime (68911207) and next prime (68911211).

It is not a de Polignac number, because 68911209 - 2¹ = 68911207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68911207) 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, 1974 + ... + 11904.

It is an arithmetic number, because the mean of its divisors is an integer number (6406140).

Almost surely, 2^68911209 is an apocalyptic number.

It is an amenable number.

68911209 is a deficient number, since it is larger than the sum of its proper divisors (33587031).

68911209 is a wasteful number, since it uses less digits than its factorization.

68911209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10197 (or 10191 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 68911209 is about 8301.2775522807. The cubic root of 68911209 is about 409.9805840498.

It can be divided in two parts, 6891 and 1209, that added together give a square (8100 = 90²).

The spelling of 68911209 in words is "sixty-eight million, nine hundred eleven thousand, two hundred nine".