68386509 has 6 divisors (see below), whose sum is σ = 98780526. Its totient is φ = 45591000.

The previous prime is 68386481. The next prime is 68386517. The reversal of 68386509 is 90568386.

68386509 is a `hidden beast` number, since 68 + 3 + 86 + 509 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 30008484 = 6195^2 + 5478^2 .

It is not a de Polignac number, because 68386509 - 2¹¹ = 68384461 is a prime.

It is a super-2 number, since 2×68386509² = 9353429226414162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68386519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3799242 + ... + 3799259.

It is an arithmetic number, because the mean of its divisors is an integer number (16463421).

Almost surely, 2^68386509 is an apocalyptic number.

It is an amenable number.

68386509 is a deficient number, since it is larger than the sum of its proper divisors (30394017).

68386509 is a wasteful number, since it uses less digits than its factorization.

68386509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7598507 (or 7598504 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 68386509 is about 8269.6135943586. The cubic root of 68386509 is about 408.9373811910.

The spelling of 68386509 in words is "sixty-eight million, three hundred eighty-six thousand, five hundred nine".