77117889 has 4 divisors (see below), whose sum is σ = 102823856. Its totient is φ = 51411924.

The previous prime is 77117881. The next prime is 77117917. The reversal of 77117889 is 98871177.

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.

It is not a de Polignac number, because 77117889 - 2³ = 77117881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77117881) 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, 12852979 + ... + 12852984.

It is an arithmetic number, because the mean of its divisors is an integer number (25705964).

Almost surely, 2^77117889 is an apocalyptic number.

It is an amenable number.

77117889 is a deficient number, since it is larger than the sum of its proper divisors (25705967).

77117889 is a wasteful number, since it uses less digits than its factorization.

77117889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25705966.

The product of its digits is 197568, while the sum is 48.

The square root of 77117889 is about 8781.6791674486. The cubic root of 77117889 is about 425.6490916605.

The spelling of 77117889 in words is "seventy-seven million, one hundred seventeen thousand, eight hundred eighty-nine".