2489978785 has 16 divisors (see below), whose sum is σ = 3594556800. Its totient is φ = 1617549696.

The previous prime is 2489978779. The next prime is 2489978833. The reversal of 2489978785 is 5878799842.

It is not a de Polignac number, because 2489978785 - 2⁹ = 2489978273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2489978785.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1871500 + ... + 1872829.

It is an arithmetic number, because the mean of its divisors is an integer number (224659800).

Almost surely, 2^2489978785 is an apocalyptic number.

It is an amenable number.

2489978785 is a deficient number, since it is larger than the sum of its proper divisors (1104578015).

2489978785 is a wasteful number, since it uses less digits than its factorization.

2489978785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744360.

The product of its digits is 81285120, while the sum is 67.

The square root of 2489978785 is about 49899.6872234686. The cubic root of 2489978785 is about 1355.3929289872.

It can be divided in two parts, 24899 and 78785, that added together give a square (103684 = 322²).

The spelling of 2489978785 in words is "two billion, four hundred eighty-nine million, nine hundred seventy-eight thousand, seven hundred eighty-five".