2609808778 has 16 divisors (see below), whose sum is σ = 3942483840. Its totient is φ = 1295679616.

The previous prime is 2609808769. The next prime is 2609808779. The reversal of 2609808778 is 8778089062.

It is a super-2 number, since 2×2609808778² = 13622203715451706568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2609808779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161001 + ... + 176467.

It is an arithmetic number, because the mean of its divisors is an integer number (246405240).

Almost surely, 2^2609808778 is an apocalyptic number.

2609808778 is a deficient number, since it is larger than the sum of its proper divisors (1332675062).

2609808778 is a wasteful number, since it uses less digits than its factorization.

2609808778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16061.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The square root of 2609808778 is about 51086.2875730856. The cubic root of 2609808778 is about 1376.7958952012.

The spelling of 2609808778 in words is "two billion, six hundred nine million, eight hundred eight thousand, seven hundred seventy-eight".