261133768 has 32 divisors (see below), whose sum is σ = 562685760. Its totient is φ = 111291840.

The previous prime is 261133759. The next prime is 261133771. The reversal of 261133768 is 867331162.

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 7 ways as a sum of consecutive naturals, for example, 2746 + ... + 23017.

It is an arithmetic number, because the mean of its divisors is an integer number (17583930).

Almost surely, 2^261133768 is an apocalyptic number.

261133768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261133768 is an abundant number, since it is smaller than the sum of its proper divisors (301551992).

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

261133768 is a wasteful number, since it uses less digits than its factorization.

261133768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25957 (or 25953 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 261133768 is about 16159.6339067443. The cubic root of 261133768 is about 639.1768127395.

The spelling of 261133768 in words is "two hundred sixty-one million, one hundred thirty-three thousand, seven hundred sixty-eight".