77117320 has 32 divisors (see below), whose sum is σ = 198302400. Its totient is φ = 26440128.

The previous prime is 77117311. The next prime is 77117323. The reversal of 77117320 is 2371177.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (77117323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137430 + ... + 137989.

It is an arithmetic number, because the mean of its divisors is an integer number (6196950).

Almost surely, 2^77117320 is an apocalyptic number.

77117320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77117320 is an abundant number, since it is smaller than the sum of its proper divisors (121185080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77117320 is a wasteful number, since it uses less digits than its factorization.

77117320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275437 (or 275433 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 28.

The square root of 77117320 is about 8781.6467703956. The cubic root of 77117320 is about 425.6480448004.

Adding to 77117320 its reverse (2371177), we get a palindrome (79488497).

The spelling of 77117320 in words is "seventy-seven million, one hundred seventeen thousand, three hundred twenty".