2277777778 has 4 divisors (see below), whose sum is σ = 3416666670. Its totient is φ = 1138888888.

The previous prime is 2277777763. The next prime is 2277777797. The reversal of 2277777778 is 8777777722.

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

It can be written as a sum of positive squares in only one way, i.e., 1465128729 + 812649049 = 38277^2 + 28507^2 .

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569444443 + ... + 569444446.

Almost surely, 2^2277777778 is an apocalyptic number.

2277777778 is a deficient number, since it is larger than the sum of its proper divisors (1138888892).

2277777778 is a wasteful number, since it uses less digits than its factorization.

2277777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138888891.

The product of its digits is 26353376, while the sum is 61.

The square root of 2277777778 is about 47726.0702132493. The cubic root of 2277777778 is about 1315.7411288708.

The spelling of 2277777778 in words is "two billion, two hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".