77161616 has 40 divisors (see below), whose sum is σ = 173768640. Its totient is φ = 32505984.

The previous prime is 77161597. The next prime is 77161621. The reversal of 77161616 is 61616177.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (4344216).

Almost surely, 2^77161616 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 77161616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86884320).

77161616 is an abundant number, since it is smaller than the sum of its proper divisors (96607024).

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

77161616 is a wasteful number, since it uses less digits than its factorization.

77161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11751 (or 11745 counting only the distinct ones).

The product of its digits is 10584, while the sum is 35.

The square root of 77161616 is about 8784.1684865444. The cubic root of 77161616 is about 425.7295262668.

It can be divided in two parts, 77161 and 616, that added together give a palindrome (77777).

The spelling of 77161616 in words is "seventy-seven million, one hundred sixty-one thousand, six hundred sixteen".