2778858842 has 4 divisors (see below), whose sum is σ = 4168288266. Its totient is φ = 1389429420.

The previous prime is 2778858839. The next prime is 2778858857. The reversal of 2778858842 is 2488588772.

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., 2163273121 + 615585721 = 46511^2 + 24811^2 .

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, 694714709 + ... + 694714712.

Almost surely, 2^2778858842 is an apocalyptic number.

2778858842 is a deficient number, since it is larger than the sum of its proper divisors (1389429424).

2778858842 is a wasteful number, since it uses less digits than its factorization.

2778858842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389429423.

The product of its digits is 16056320, while the sum is 59.

The square root of 2778858842 is about 52714.8825475311. The cubic root of 2778858842 is about 1405.9034461598.

The spelling of 2778858842 in words is "two billion, seven hundred seventy-eight million, eight hundred fifty-eight thousand, eight hundred forty-two".