261604476 has 72 divisors (see below), whose sum is σ = 781828320. Its totient is φ = 72164736.

The previous prime is 261604459. The next prime is 261604481. The reversal of 261604476 is 674406162.

261604476 is a `hidden beast` number, since 2 + 6 + 1 + 604 + 47 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 261604476.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10591 + ... + 25206.

Almost surely, 2^261604476 is an apocalyptic number.

It is an amenable number.

261604476 is an abundant number, since it is smaller than the sum of its proper divisors (520223844).

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

261604476 is a wasteful number, since it uses less digits than its factorization.

261604476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35843 (or 35838 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 261604476 is about 16174.1916645006. The cubic root of 261604476 is about 639.5606326831.

The spelling of 261604476 in words is "two hundred sixty-one million, six hundred four thousand, four hundred seventy-six".