68309185 has 12 divisors (see below), whose sum is σ = 95354388. Its totient is φ = 46840416.

The previous prime is 68309183. The next prime is 68309207. The reversal of 68309185 is 58190386.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9878449 + 58430736 = 3143^2 + 7644^2 .

It is not a de Polignac number, because 68309185 - 2¹ = 68309183 is a prime.

It is a super-2 number, since 2×68309185² = 9332289510728450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68309183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139162 + ... + 139651.

It is an arithmetic number, because the mean of its divisors is an integer number (7946199).

Almost surely, 2^68309185 is an apocalyptic number.

It is an amenable number.

68309185 is a deficient number, since it is larger than the sum of its proper divisors (27045203).

68309185 is a wasteful number, since it uses less digits than its factorization.

68309185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278832 (or 278825 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 68309185 is about 8264.9370838501. The cubic root of 68309185 is about 408.7831958127.

The spelling of 68309185 in words is "sixty-eight million, three hundred nine thousand, one hundred eighty-five".