2778249799 has 4 divisors (see below), whose sum is σ = 2991961336. Its totient is φ = 2564538264.

The previous prime is 2778249779. The next prime is 2778249829. The reversal of 2778249799 is 9979428772.

It is a happy number.

2778249799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2778249799 - 2⁵ = 2778249767 is a prime.

It is a super-3 number, since 3×2778249799³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2778249799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778249739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106855749 + ... + 106855774.

It is an arithmetic number, because the mean of its divisors is an integer number (747990334).

Almost surely, 2^2778249799 is an apocalyptic number.

2778249799 is a deficient number, since it is larger than the sum of its proper divisors (213711537).

2778249799 is a wasteful number, since it uses less digits than its factorization.

2778249799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213711536.

The product of its digits is 32006016, while the sum is 64.

The square root of 2778249799 is about 52709.1054657542. The cubic root of 2778249799 is about 1405.8007279501.

The spelling of 2778249799 in words is "two billion, seven hundred seventy-eight million, two hundred forty-nine thousand, seven hundred ninety-nine".