261879868 has 6 divisors (see below), whose sum is σ = 458289776. Its totient is φ = 130939932.

The previous prime is 261879851. The next prime is 261879887. The reversal of 261879868 is 868978162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32734980 + ... + 32734987.

Almost surely, 2^261879868 is an apocalyptic number.

It is an amenable number.

261879868 is a deficient number, since it is larger than the sum of its proper divisors (196409908).

261879868 is a wasteful number, since it uses less digits than its factorization.

261879868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65469971 (or 65469969 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The square root of 261879868 is about 16182.7027408897. The cubic root of 261879868 is about 639.7849765939.

The spelling of 261879868 in words is "two hundred sixty-one million, eight hundred seventy-nine thousand, eight hundred sixty-eight".