136404878 has 4 divisors (see below), whose sum is σ = 204607320. Its totient is φ = 68202438.

The previous prime is 136404847. The next prime is 136404883. The reversal of 136404878 is 878404631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 878404631 = 13 ⋅67569587.

136404878 is a modest number, since divided by 4878 gives 1364 as remainder.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 34101218 + ... + 34101221.

It is an arithmetic number, because the mean of its divisors is an integer number (51151830).

Almost surely, 2^136404878 is an apocalyptic number.

136404878 is a deficient number, since it is larger than the sum of its proper divisors (68202442).

136404878 is an equidigital number, since it uses as much as digits as its factorization.

136404878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68202441.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 136404878 is about 11679.2498902969. The cubic root of 136404878 is about 514.7661338002.

The spelling of 136404878 in words is "one hundred thirty-six million, four hundred four thousand, eight hundred seventy-eight".