2777778 has 12 divisors (see below), whose sum is σ = 6018558. Its totient is φ = 925920.

The previous prime is 2777771. The next prime is 2777813. The reversal of 2777778 is 8777772.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2732409 + 45369 = 1653^2 + 213^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (2777771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77143 + ... + 77178.

2^2777778 is an apocalyptic number.

2777778 is an abundant number, since it is smaller than the sum of its proper divisors (3240780).

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

2777778 is a wasteful number, since it uses less digits than its factorization.

2777778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154329 (or 154326 counting only the distinct ones).

The product of its digits is 268912, while the sum is 45.

The square root of 2777778 is about 1666.6667333333. Note that the first 3 decimals coincide. The cubic root of 2777778 is about 140.5721146322.

The spelling of 2777778 in words is "two million, seven hundred seventy-seven thousand, seven hundred seventy-eight".