2561869220 has 12 divisors (see below), whose sum is σ = 5379925404. Its totient is φ = 1024747680.

The previous prime is 2561869169. The next prime is 2561869223. The reversal of 2561869220 is 229681652.

It can be written as a sum of positive squares in 2 ways, for example, as 1081620544 + 1480248676 = 32888^2 + 38474^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2561869223) 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 3 ways as a sum of consecutive naturals, for example, 64046711 + ... + 64046750.

It is an arithmetic number, because the mean of its divisors is an integer number (448327117).

Almost surely, 2^2561869220 is an apocalyptic number.

2561869220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561869220 is an abundant number, since it is smaller than the sum of its proper divisors (2818056184).

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

2561869220 is a wasteful number, since it uses less digits than its factorization.

2561869220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128093470 (or 128093468 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 2561869220 is about 50614.9110440787. The cubic root of 2561869220 is about 1368.3136264672.

The spelling of 2561869220 in words is "two billion, five hundred sixty-one million, eight hundred sixty-nine thousand, two hundred twenty".