136506778 has 8 divisors (see below), whose sum is σ = 205639668. Its totient is φ = 67960224.

The previous prime is 136506763. The next prime is 136506781. The reversal of 136506778 is 877605631.

It can be written as a sum of positive squares in 2 ways, for example, as 136352329 + 154449 = 11677^2 + 393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 146001 + ... + 146932.

Almost surely, 2^136506778 is an apocalyptic number.

136506778 is a deficient number, since it is larger than the sum of its proper divisors (69132890).

136506778 is a wasteful number, since it uses less digits than its factorization.

136506778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293168.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 136506778 is about 11683.6115135689. The cubic root of 136506778 is about 514.8942856505.

The spelling of 136506778 in words is "one hundred thirty-six million, five hundred six thousand, seven hundred seventy-eight".