68978185 has 4 divisors (see below), whose sum is σ = 82773828. Its totient is φ = 55182544.

The previous prime is 68978179. The next prime is 68978191. The reversal of 68978185 is 58187986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58187986 = 2 ⋅29093993.

It is an interprime number because it is at equal distance from previous prime (68978179) and next prime (68978191).

It can be written as a sum of positive squares in 2 ways, for example, as 42876304 + 26101881 = 6548^2 + 5109^2 .

It is a cyclic number.

It is not a de Polignac number, because 68978185 - 2⁷ = 68978057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6897814 + ... + 6897823.

It is an arithmetic number, because the mean of its divisors is an integer number (20693457).

Almost surely, 2^68978185 is an apocalyptic number.

It is an amenable number.

68978185 is a deficient number, since it is larger than the sum of its proper divisors (13795643).

68978185 is a wasteful number, since it uses less digits than its factorization.

68978185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13795642.

The product of its digits is 967680, while the sum is 52.

The square root of 68978185 is about 8305.3106504212. The cubic root of 68978185 is about 410.1133634572.

The spelling of 68978185 in words is "sixty-eight million, nine hundred seventy-eight thousand, one hundred eighty-five".