2489978779 has 2 divisors, whose sum is σ = 2489978780. Its totient is φ = 2489978778.

The previous prime is 2489978767. The next prime is 2489978833. The reversal of 2489978779 is 9778799842.

2489978779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2489978779 is a prime.

It is not a weakly prime, because it can be changed into another prime (2489978479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1244989389 + 1244989390.

It is an arithmetic number, because the mean of its divisors is an integer number (1244989390).

Almost surely, 2^2489978779 is an apocalyptic number.

2489978779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2489978779 is an equidigital number, since it uses as much as digits as its factorization.

2489978779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128024064, while the sum is 70.

The square root of 2489978779 is about 49899.6871633480. The cubic root of 2489978779 is about 1355.3929278985.

The spelling of 2489978779 in words is "two billion, four hundred eighty-nine million, nine hundred seventy-eight thousand, seven hundred seventy-nine".