261805256 has 32 divisors (see below), whose sum is σ = 517514400. Its totient is φ = 123822720.

The previous prime is 261805211. The next prime is 261805279. The reversal of 261805256 is 652508162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176036 + ... + 177516.

It is an arithmetic number, because the mean of its divisors is an integer number (16172325).

Almost surely, 2^261805256 is an apocalyptic number.

It is an amenable number.

261805256 is a deficient number, since it is larger than the sum of its proper divisors (255709144).

261805256 is a wasteful number, since it uses less digits than its factorization.

261805256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2665 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 261805256 is about 16180.3972757161. The cubic root of 261805256 is about 639.7242106007.

The spelling of 261805256 in words is "two hundred sixty-one million, eight hundred five thousand, two hundred fifty-six".