78185853 has 6 divisors (see below), whose sum is σ = 112935134. Its totient is φ = 52123896.

The previous prime is 78185803. The next prime is 78185857. The reversal of 78185853 is 35858187.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77475204 + 710649 = 8802^2 + 843^2 .

It is not a de Polignac number, because 78185853 - 2¹⁸ = 77923709 is a prime.

It is a super-2 number, since 2×78185853² = 12226055218675218, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78185799 and 78185808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78185857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4343650 + ... + 4343667.

Almost surely, 2^78185853 is an apocalyptic number.

It is an amenable number.

78185853 is a deficient number, since it is larger than the sum of its proper divisors (34749281).

78185853 is a wasteful number, since it uses less digits than its factorization.

78185853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8687323 (or 8687320 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 78185853 is about 8842.2764602788. The cubic root of 78185853 is about 427.6049521738.

The spelling of 78185853 in words is "seventy-eight million, one hundred eighty-five thousand, eight hundred fifty-three".