78136 has 8 divisors (see below), whose sum is σ = 146520. Its totient is φ = 39064.

The previous prime is 78121. The next prime is 78137. The reversal of 78136 is 63187.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78136² = 12210468992, 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 78136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4876 + ... + 4891.

It is an arithmetic number, because the mean of its divisors is an integer number (18315).

78136 is a Friedman number, since it can be written as 8+3+(6-1)^7, using all its digits and the basic arithmetic operations.

2⁷⁸¹³⁶ is an apocalyptic number.

It is an amenable number.

78136 is a deficient number, since it is larger than the sum of its proper divisors (68384).

78136 is a wasteful number, since it uses less digits than its factorization.

78136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9773 (or 9769 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 78136 is about 279.5281738931. The cubic root of 78136 is about 42.7514049445.

The spelling of 78136 in words is "seventy-eight thousand, one hundred thirty-six".