2609879778 has 56 divisors (see below), whose sum is σ = 6403178736. Its totient is φ = 790867800.

The previous prime is 2609879777. The next prime is 2609879791. The reversal of 2609879778 is 8779789062.

It is a super-3 number, since 3×2609879778³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2609879771) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 65328 + ... + 97403.

Almost surely, 2^2609879778 is an apocalyptic number.

2609879778 is an abundant number, since it is smaller than the sum of its proper divisors (3793298958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2609879778 is a wasteful number, since it uses less digits than its factorization.

2609879778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162762 (or 162747 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The square root of 2609879778 is about 51086.9824710757. The cubic root of 2609879778 is about 1376.8083803589.

The spelling of 2609879778 in words is "two billion, six hundred nine million, eight hundred seventy-nine thousand, seven hundred seventy-eight".