2749495778 has 4 divisors (see below), whose sum is σ = 4124243670. Its totient is φ = 1374747888.

The previous prime is 2749495769. The next prime is 2749495783. The reversal of 2749495778 is 8775949472.

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., 2311974889 + 437520889 = 48083^2 + 20917^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2749495778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687373943 + ... + 687373946.

Almost surely, 2^2749495778 is an apocalyptic number.

2749495778 is a deficient number, since it is larger than the sum of its proper divisors (1374747892).

2749495778 is a wasteful number, since it uses less digits than its factorization.

2749495778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374747891.

The product of its digits is 35562240, while the sum is 62.

The square root of 2749495778 is about 52435.6346199796. The cubic root of 2749495778 is about 1400.9340328286.

The spelling of 2749495778 in words is "two billion, seven hundred forty-nine million, four hundred ninety-five thousand, seven hundred seventy-eight".