261220868 has 12 divisors (see below), whose sum is σ = 459506460. Its totient is φ = 129933312.

The previous prime is 261220859. The next prime is 261220871. The reversal of 261220868 is 868022162.

It can be written as a sum of positive squares in 2 ways, for example, as 157954624 + 103266244 = 12568^2 + 10162^2 .

It is an unprimeable number.

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, 168413 + ... + 169956.

It is an arithmetic number, because the mean of its divisors is an integer number (38292205).

Almost surely, 2^261220868 is an apocalyptic number.

It is an amenable number.

261220868 is a deficient number, since it is larger than the sum of its proper divisors (198285592).

261220868 is a wasteful number, since it uses less digits than its factorization.

261220868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338566 (or 338564 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 261220868 is about 16162.3286688521. The cubic root of 261220868 is about 639.2478696952.

The spelling of 261220868 in words is "two hundred sixty-one million, two hundred twenty thousand, eight hundred sixty-eight".