78135189 has 16 divisors (see below), whose sum is σ = 114053184. Its totient is φ = 47187200.

The previous prime is 78135181. The next prime is 78135203. The reversal of 78135189 is 98153187.

It is a cyclic number.

It is not a de Polignac number, because 78135189 - 2³ = 78135181 is a prime.

It is a super-2 number, since 2×78135189² = 12210215520131442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78135189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5629 + ... + 13709.

It is an arithmetic number, because the mean of its divisors is an integer number (7128324).

Almost surely, 2^78135189 is an apocalyptic number.

It is an amenable number.

78135189 is a deficient number, since it is larger than the sum of its proper divisors (35917995).

78135189 is a wasteful number, since it uses less digits than its factorization.

78135189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8388.

The product of its digits is 60480, while the sum is 42.

The square root of 78135189 is about 8839.4111229199. The cubic root of 78135189 is about 427.5125703359.

The spelling of 78135189 in words is "seventy-eight million, one hundred thirty-five thousand, one hundred eighty-nine".