77108138 has 4 divisors (see below), whose sum is σ = 115662210. Its totient is φ = 38554068.

The previous prime is 77108131. The next prime is 77108173. The reversal of 77108138 is 83180177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83180177 = 47 ⋅1769791.

It can be written as a sum of positive squares in only one way, i.e., 60109009 + 16999129 = 7753^2 + 4123^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77108098 and 77108107.

It is not an unprimeable number, because it can be changed into a prime (77108131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19277033 + ... + 19277036.

Almost surely, 2^77108138 is an apocalyptic number.

77108138 is a deficient number, since it is larger than the sum of its proper divisors (38554072).

77108138 is a wasteful number, since it uses less digits than its factorization.

77108138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38554071.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 77108138 is about 8781.1239599495. The cubic root of 77108138 is about 425.6311508200.

The spelling of 77108138 in words is "seventy-seven million, one hundred eight thousand, one hundred thirty-eight".