2778947395 has 16 divisors (see below), whose sum is σ = 3811992768. Its totient is φ = 1905131520.

The previous prime is 2778947389. The next prime is 2778947399. The reversal of 2778947395 is 5937498772.

It is not a de Polignac number, because 2778947395 - 2³ = 2778947387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778947399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263667 + ... + 274003.

It is an arithmetic number, because the mean of its divisors is an integer number (238249548).

Almost surely, 2^2778947395 is an apocalyptic number.

2778947395 is a deficient number, since it is larger than the sum of its proper divisors (1033045373).

2778947395 is a wasteful number, since it uses less digits than its factorization.

2778947395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18030.

The product of its digits is 26671680, while the sum is 61.

The square root of 2778947395 is about 52715.7224649345. The cubic root of 2778947395 is about 1405.9183798253.

The spelling of 2778947395 in words is "two billion, seven hundred seventy-eight million, nine hundred forty-seven thousand, three hundred ninety-five".