68490309 has 8 divisors (see below), whose sum is σ = 91520352. Its totient is φ = 45560240.

The previous prime is 68490299. The next prime is 68490311. The reversal of 68490309 is 90309486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68490309 - 2⁵ = 68490277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68490329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23379 + ... + 26144.

It is an arithmetic number, because the mean of its divisors is an integer number (11440044).

Almost surely, 2^68490309 is an apocalyptic number.

It is an amenable number.

68490309 is a deficient number, since it is larger than the sum of its proper divisors (23030043).

68490309 is a wasteful number, since it uses less digits than its factorization.

68490309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49987.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 68490309 is about 8275.8872031946. The cubic root of 68490309 is about 409.1441775439.

The spelling of 68490309 in words is "sixty-eight million, four hundred ninety thousand, three hundred nine".