2620805881 has 4 divisors (see below), whose sum is σ = 2620963152. Its totient is φ = 2620648612.

The previous prime is 2620805819. The next prime is 2620805903. The reversal of 2620805881 is 1885080262.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2620805881 - 2¹¹ = 2620803833 is a prime.

It is a super-2 number, since 2×2620805881² = 13737246931768372322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2620805801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50215 + ... + 88108.

It is an arithmetic number, because the mean of its divisors is an integer number (655240788).

Almost surely, 2^2620805881 is an apocalyptic number.

It is an amenable number.

2620805881 is a deficient number, since it is larger than the sum of its proper divisors (157271).

2620805881 is a wasteful number, since it uses less digits than its factorization.

2620805881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157270.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 2620805881 is about 51193.8070571041. The cubic root of 2620805881 is about 1378.7270136205.

The spelling of 2620805881 in words is "two billion, six hundred twenty million, eight hundred five thousand, eight hundred eighty-one".