77385109 has 4 divisors (see below), whose sum is σ = 77649516. Its totient is φ = 77120704.

The previous prime is 77385107. The next prime is 77385127. The reversal of 77385109 is 90158377.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35070084 + 42315025 = 5922^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 77385109 - 2¹ = 77385107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77385107) 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, 131764 + ... + 132349.

It is an arithmetic number, because the mean of its divisors is an integer number (19412379).

Almost surely, 2^77385109 is an apocalyptic number.

It is an amenable number.

77385109 is a deficient number, since it is larger than the sum of its proper divisors (264407).

77385109 is a wasteful number, since it uses less digits than its factorization.

77385109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264406.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 77385109 is about 8796.8806403179. The cubic root of 77385109 is about 426.1401615835.

The spelling of 77385109 in words is "seventy-seven million, three hundred eighty-five thousand, one hundred nine".