136778 has 4 divisors (see below), whose sum is σ = 205170. Its totient is φ = 68388.

The previous prime is 136777. The next prime is 136811. The reversal of 136778 is 877631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 97969 + 38809 = 313^2 + 197^2 .

It is a super-4 number, since 4×136778⁴ (a number of 22 digits) contains 4444 as substring.

It is a plaindrome in base 10 and base 14.

It is not an unprimeable number, because it can be changed into a prime (136777) 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, 34193 + ... + 34196.

2¹³⁶⁷⁷⁸ is an apocalyptic number.

136778 is a deficient number, since it is larger than the sum of its proper divisors (68392).

136778 is an equidigital number, since it uses as much as digits as its factorization.

136778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68391.

The product of its digits is 7056, while the sum is 32.

The square root of 136778 is about 369.8350983885. The cubic root of 136778 is about 51.5235070366.

The spelling of 136778 in words is "one hundred thirty-six thousand, seven hundred seventy-eight".