77071138 has 4 divisors (see below), whose sum is σ = 115606710. Its totient is φ = 38535568.

The previous prime is 77071133. The next prime is 77071151. The reversal of 77071138 is 83117077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83117077 = 19 ⋅4374583.

It can be written as a sum of positive squares in only one way, i.e., 70274689 + 6796449 = 8383^2 + 2607^2 .

It is not an unprimeable number, because it can be changed into a prime (77071133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19267783 + ... + 19267786.

Almost surely, 2^77071138 is an apocalyptic number.

77071138 is a deficient number, since it is larger than the sum of its proper divisors (38535572).

77071138 is a wasteful number, since it uses less digits than its factorization.

77071138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38535571.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 77071138 is about 8779.0169153499. The cubic root of 77071138 is about 425.5630608510.

The spelling of 77071138 in words is "seventy-seven million, seventy-one thousand, one hundred thirty-eight".