77171320 has 64 divisors (see below), whose sum is σ = 182347200. Its totient is φ = 29352960.

The previous prime is 77171299. The next prime is 77171323. The reversal of 77171320 is 2317177.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77171323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81892 + ... + 82828.

It is an arithmetic number, because the mean of its divisors is an integer number (2849175).

Almost surely, 2^77171320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77171320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91173600).

77171320 is an abundant number, since it is smaller than the sum of its proper divisors (105175880).

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

77171320 is a wasteful number, since it uses less digits than its factorization.

77171320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1044 counting only the distinct ones).

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

The square root of 77171320 is about 8784.7208265260. The cubic root of 77171320 is about 425.7473723858.

Adding to 77171320 its reverse (2317177), we get a palindrome (79488497).

The spelling of 77171320 in words is "seventy-seven million, one hundred seventy-one thousand, three hundred twenty".