136779638 has 4 divisors (see below), whose sum is σ = 205169460. Its totient is φ = 68389818.

The previous prime is 136779623. The next prime is 136779659. The reversal of 136779638 is 836977631.

136779638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×136779638² = 37417338742822088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194908 + ... + 34194911.

It is an arithmetic number, because the mean of its divisors is an integer number (51292365).

Almost surely, 2^136779638 is an apocalyptic number.

136779638 is a deficient number, since it is larger than the sum of its proper divisors (68389822).

136779638 is an equidigital number, since it uses as much as digits as its factorization.

136779638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68389821.

The product of its digits is 1143072, while the sum is 50.

The square root of 136779638 is about 11695.2827242440. The cubic root of 136779638 is about 515.2371271090.

The spelling of 136779638 in words is "one hundred thirty-six million, seven hundred seventy-nine thousand, six hundred thirty-eight".