2478126779 has 4 divisors (see below), whose sum is σ = 2493911184. Its totient is φ = 2462342376.

The previous prime is 2478126751. The next prime is 2478126787. The reversal of 2478126779 is 9776218742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9776218742 = 2 ⋅4888109371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2478126779 is a prime.

It is a super-2 number, since 2×2478126779² = 12282224665593829682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2478126779.

It is not an unprimeable number, because it can be changed into a prime (2478126379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7891967 + ... + 7892280.

It is an arithmetic number, because the mean of its divisors is an integer number (623477796).

Almost surely, 2^2478126779 is an apocalyptic number.

2478126779 is a deficient number, since it is larger than the sum of its proper divisors (15784405).

2478126779 is a wasteful number, since it uses less digits than its factorization.

2478126779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15784404.

The product of its digits is 2370816, while the sum is 53.

The square root of 2478126779 is about 49780.7872476923. The cubic root of 2478126779 is about 1353.2390042738.

The spelling of 2478126779 in words is "two billion, four hundred seventy-eight million, one hundred twenty-six thousand, seven hundred seventy-nine".