68490009 has 16 divisors (see below), whose sum is σ = 115962240. Its totient is φ = 39137040.

The previous prime is 68489983. The next prime is 68490017. The reversal of 68490009 is 90009486.

It is not a de Polignac number, because 68490009 - 2¹¹ = 68487961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68490089) 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, 181002 + ... + 181379.

It is an arithmetic number, because the mean of its divisors is an integer number (7247640).

Almost surely, 2^68490009 is an apocalyptic number.

It is an amenable number.

68490009 is a deficient number, since it is larger than the sum of its proper divisors (47472231).

68490009 is a wasteful number, since it uses less digits than its factorization.

68490009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362397 (or 362391 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 68490009 is about 8275.8690782298. The cubic root of 68490009 is about 409.1435801677.

It can be divided in two parts, 684 and 90009, that multiplied together give a triangular number (61566156 = T₁₁₀₉₆).

The spelling of 68490009 in words is "sixty-eight million, four hundred ninety thousand, nine".