2778365887 has 8 divisors (see below), whose sum is σ = 3031438032. Its totient is φ = 2525376000.

The previous prime is 2778365881. The next prime is 2778365893. The reversal of 2778365887 is 7885638772.

It is an interprime number because it is at equal distance from previous prime (2778365881) and next prime (2778365893).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2778365887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778365881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65887 + ... + 99487.

It is an arithmetic number, because the mean of its divisors is an integer number (378929754).

Almost surely, 2^2778365887 is an apocalyptic number.

2778365887 is a deficient number, since it is larger than the sum of its proper divisors (253072145).

2778365887 is a wasteful number, since it uses less digits than its factorization.

2778365887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41129.

The product of its digits is 31610880, while the sum is 61.

The square root of 2778365887 is about 52710.2066681587. The cubic root of 2778365887 is about 1405.8203079415.

The spelling of 2778365887 in words is "two billion, seven hundred seventy-eight million, three hundred sixty-five thousand, eight hundred eighty-seven".