261489068 has 12 divisors (see below), whose sum is σ = 466240320. Its totient is φ = 128277552.

The previous prime is 261489043. The next prime is 261489073. The reversal of 261489068 is 860984162.

It is a happy number.

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, 616508 + ... + 616931.

It is an arithmetic number, because the mean of its divisors is an integer number (38853360).

Almost surely, 2^261489068 is an apocalyptic number.

It is an amenable number.

261489068 is a deficient number, since it is larger than the sum of its proper divisors (204751252).

261489068 is a wasteful number, since it uses less digits than its factorization.

261489068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233496 (or 1233494 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 261489068 is about 16170.6236119699. The cubic root of 261489068 is about 639.4665704927.

The spelling of 261489068 in words is "two hundred sixty-one million, four hundred eighty-nine thousand, sixty-eight".