136221778 has 32 divisors (see below), whose sum is σ = 265835520. Its totient is φ = 50764560.

The previous prime is 136221749. The next prime is 136221793. The reversal of 136221778 is 877122631.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15688 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (8307360).

Almost surely, 2^136221778 is an apocalyptic number.

136221778 is a deficient number, since it is larger than the sum of its proper divisors (129613742).

136221778 is a wasteful number, since it uses less digits than its factorization.

136221778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38502.

The product of its digits is 28224, while the sum is 37.

The square root of 136221778 is about 11671.4085696629. The cubic root of 136221778 is about 514.5357024426.

It can be divided in two parts, 13622 and 1778, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 136221778 in words is "one hundred thirty-six million, two hundred twenty-one thousand, seven hundred seventy-eight".