261641304 has 24 divisors (see below), whose sum is σ = 708612060. Its totient is φ = 87213744.

The previous prime is 261641297. The next prime is 261641309. The reversal of 261641304 is 403146162.

261641304 is a `hidden beast` number, since 2 + 616 + 41 + 3 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261641309) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1816882 + ... + 1817025.

Almost surely, 2^261641304 is an apocalyptic number.

261641304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261641304 is an abundant number, since it is smaller than the sum of its proper divisors (446970756).

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

261641304 is a wasteful number, since it uses less digits than its factorization.

261641304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633919 (or 3633912 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 261641304 is about 16175.3301048232. The cubic root of 261641304 is about 639.5906431709.

Adding to 261641304 its reverse (403146162), we get a palindrome (664787466).

The spelling of 261641304 in words is "two hundred sixty-one million, six hundred forty-one thousand, three hundred four".