261220604 has 6 divisors (see below), whose sum is σ = 457136064. Its totient is φ = 130610300.

The previous prime is 261220549. The next prime is 261220627. The reversal of 261220604 is 406022162.

261220604 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261220604.

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 as a sum of consecutive naturals, namely, 32652572 + ... + 32652579.

It is an arithmetic number, because the mean of its divisors is an integer number (76189344).

Almost surely, 2^261220604 is an apocalyptic number.

It is an amenable number.

261220604 is a deficient number, since it is larger than the sum of its proper divisors (195915460).

261220604 is a wasteful number, since it uses less digits than its factorization.

261220604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65305155 (or 65305153 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 261220604 is about 16162.3205017101. The cubic root of 261220604 is about 639.2476543455.

Adding to 261220604 its reverse (406022162), we get a palindrome (667242766).

The spelling of 261220604 in words is "two hundred sixty-one million, two hundred twenty thousand, six hundred four".