2505605278 has 32 divisors (see below), whose sum is σ = 4464720000. Its totient is φ = 1041757920.

The previous prime is 2505605251. The next prime is 2505605279. The reversal of 2505605278 is 8725065052.

It is a self number, because there is not a number n which added to its sum of digits gives 2505605278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505605279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91228 + ... + 115471.

It is an arithmetic number, because the mean of its divisors is an integer number (139522500).

Almost surely, 2^2505605278 is an apocalyptic number.

2505605278 is a deficient number, since it is larger than the sum of its proper divisors (1959114722).

2505605278 is a wasteful number, since it uses less digits than its factorization.

2505605278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206760.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 2505605278 is about 50056.0213960319. The cubic root of 2505605278 is about 1358.2223888443. Note that the first 3 decimals are identical.

The spelling of 2505605278 in words is "two billion, five hundred five million, six hundred five thousand, two hundred seventy-eight".