68516685 has 20 divisors (see below), whose sum is σ = 122823228. Its totient is φ = 36542016.

The previous prime is 68516677. The next prime is 68516687. The reversal of 68516685 is 58661586.

It can be written as a sum of positive squares in 2 ways, for example, as 52620516 + 15896169 = 7254^2 + 3987^2 .

It is not a de Polignac number, because 68516685 - 2³ = 68516677 is a prime.

It is a super-2 number, since 2×68516685² = 9389072246778450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 68516685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68516687) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84184 + ... + 84993.

Almost surely, 2^68516685 is an apocalyptic number.

It is an amenable number.

68516685 is a deficient number, since it is larger than the sum of its proper divisors (54306543).

68516685 is a wasteful number, since it uses less digits than its factorization.

68516685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169194 (or 169185 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 68516685 is about 8277.4805949637. The cubic root of 68516685 is about 409.1966920382.

The spelling of 68516685 in words is "sixty-eight million, five hundred sixteen thousand, six hundred eighty-five".