2778857842 has 16 divisors (see below), whose sum is σ = 4532765400. Its totient is φ = 1272354048.

The previous prime is 2778857831. The next prime is 2778857891. The reversal of 2778857842 is 2487588772.

It can be written as a sum of positive squares in 4 ways, for example, as 2506904761 + 271953081 = 50069^2 + 16491^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103217 + ... + 1105732.

Almost surely, 2^2778857842 is an apocalyptic number.

2778857842 is a deficient number, since it is larger than the sum of its proper divisors (1753907558).

2778857842 is a wasteful number, since it uses less digits than its factorization.

2778857842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209005.

The product of its digits is 14049280, while the sum is 58.

The square root of 2778857842 is about 52714.8730625428. The cubic root of 2778857842 is about 1405.9032775170.

The spelling of 2778857842 in words is "two billion, seven hundred seventy-eight million, eight hundred fifty-seven thousand, eight hundred forty-two".