68286509 has 4 divisors (see below), whose sum is σ = 68303040. Its totient is φ = 68269980.

The previous prime is 68286499. The next prime is 68286523. The reversal of 68286509 is 90568286.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68286509 - 2¹² = 68282413 is a prime.

It is a super-2 number, since 2×68286509² = 9326094622814162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68286509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68286409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3902 + ... + 12320.

It is an arithmetic number, because the mean of its divisors is an integer number (17075760).

Almost surely, 2^68286509 is an apocalyptic number.

It is an amenable number.

68286509 is a deficient number, since it is larger than the sum of its proper divisors (16531).

68286509 is an equidigital number, since it uses as much as digits as its factorization.

68286509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16530.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 68286509 is about 8263.5651507083. The cubic root of 68286509 is about 408.7379574178.

The spelling of 68286509 in words is "sixty-eight million, two hundred eighty-six thousand, five hundred nine".