261283884 has 12 divisors (see below), whose sum is σ = 609662424. Its totient is φ = 87094624.

The previous prime is 261283879. The next prime is 261283927. The reversal of 261283884 is 488382162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 10886817 + ... + 10886840.

It is an arithmetic number, because the mean of its divisors is an integer number (50805202).

Almost surely, 2^261283884 is an apocalyptic number.

It is an amenable number.

261283884 is an abundant number, since it is smaller than the sum of its proper divisors (348378540).

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

261283884 is a wasteful number, since it uses less digits than its factorization.

261283884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21773664 (or 21773662 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 261283884 is about 16164.2780228503. The cubic root of 261283884 is about 639.2992688621.

The spelling of 261283884 in words is "two hundred sixty-one million, two hundred eighty-three thousand, eight hundred eighty-four".