135777638 has 4 divisors (see below), whose sum is σ = 203666460. Its totient is φ = 67888818.

The previous prime is 135777619. The next prime is 135777641. The reversal of 135777638 is 836777531.

It is a happy number.

135777638 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, and also an emirpimes, since its reverse is a distinct semiprime: 836777531 = 83 ⋅10081657.

It is a junction number, because it is equal to n+sod(n) for n = 135777592 and 135777601.

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, 33944408 + ... + 33944411.

It is an arithmetic number, because the mean of its divisors is an integer number (50916615).

Almost surely, 2^135777638 is an apocalyptic number.

135777638 is a deficient number, since it is larger than the sum of its proper divisors (67888822).

135777638 is an equidigital number, since it uses as much as digits as its factorization.

135777638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67888821.

The product of its digits is 740880, while the sum is 47.

The square root of 135777638 is about 11652.3661974725. The cubic root of 135777638 is about 513.9758930288.

The spelling of 135777638 in words is "one hundred thirty-five million, seven hundred seventy-seven thousand, six hundred thirty-eight".