2742778 has 4 divisors (see below), whose sum is σ = 4114170. Its totient is φ = 1371388.

The previous prime is 2742769. The next prime is 2742781. The reversal of 2742778 is 8772472.

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., 2169729 + 573049 = 1473^2 + 757^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685693 + ... + 685696.

2^2742778 is an apocalyptic number.

2742778 is a deficient number, since it is larger than the sum of its proper divisors (1371392).

2742778 is a wasteful number, since it uses less digits than its factorization.

2742778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371391.

The product of its digits is 43904, while the sum is 37.

The square root of 2742778 is about 1656.1334487293. The cubic root of 2742778 is about 139.9792146013.

The spelling of 2742778 in words is "two million, seven hundred forty-two thousand, seven hundred seventy-eight".