77871117 has 4 divisors (see below), whose sum is σ = 103828160. Its totient is φ = 51914076.

The previous prime is 77871109. The next prime is 77871121. The reversal of 77871117 is 71117877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71117877 = 3 ⋅23705959.

It is not a de Polignac number, because 77871117 - 2³ = 77871109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77871617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12978517 + ... + 12978522.

It is an arithmetic number, because the mean of its divisors is an integer number (25957040).

Almost surely, 2^77871117 is an apocalyptic number.

It is an amenable number.

77871117 is a deficient number, since it is larger than the sum of its proper divisors (25957043).

77871117 is a wasteful number, since it uses less digits than its factorization.

77871117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25957042.

The product of its digits is 19208, while the sum is 39.

The square root of 77871117 is about 8824.4612866735. The cubic root of 77871117 is about 427.0304080636.

The spelling of 77871117 in words is "seventy-seven million, eight hundred seventy-one thousand, one hundred seventeen".