77758338208 has 12 divisors (see below), whose sum is σ = 153086728410. Its totient is φ = 38879169088.

The previous prime is 77758338179. The next prime is 77758338209. The reversal of 77758338208 is 80283385777.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 71808992784 + 5949345424 = 267972^2 + 77132^2 .

It is not an unprimeable number, because it can be changed into a prime (77758338209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1214974003 + ... + 1214974066.

Almost surely, 2^77758338208 is an apocalyptic number.

It is an amenable number.

77758338208 is a deficient number, since it is larger than the sum of its proper divisors (75328390202).

77758338208 is a wasteful number, since it uses less digits than its factorization.

77758338208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429948079 (or 2429948071 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 58.

The spelling of 77758338208 in words is "seventy-seven billion, seven hundred fifty-eight million, three hundred thirty-eight thousand, two hundred eight".