77677109 has 8 divisors (see below), whose sum is σ = 80491320. Its totient is φ = 74872000.

The previous prime is 77677079. The next prime is 77677121. The reversal of 77677109 is 90177677.

It can be written as a sum of positive squares in 4 ways, for example, as 42902500 + 34774609 = 6550^2 + 5897^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77677109 - 2²⁰ = 76628533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77677109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77677139) 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, 18419 + ... + 22239.

It is an arithmetic number, because the mean of its divisors is an integer number (10061415).

Almost surely, 2^77677109 is an apocalyptic number.

It is an amenable number.

77677109 is a deficient number, since it is larger than the sum of its proper divisors (2814211).

77677109 is a wasteful number, since it uses less digits than its factorization.

77677109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551.

The product of its (nonzero) digits is 129654, while the sum is 44.

The square root of 77677109 is about 8813.4618056698. The cubic root of 77677109 is about 426.6754788083.

The spelling of 77677109 in words is "seventy-seven million, six hundred seventy-seven thousand, one hundred nine".