261861448 has 8 divisors (see below), whose sum is σ = 490990230. Its totient is φ = 130930720.

The previous prime is 261861437. The next prime is 261861451. The reversal of 261861448 is 844168162.

261861448 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 142134084 + 119727364 = 11922^2 + 10942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 261861448.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16366333 + ... + 16366348.

Almost surely, 2^261861448 is an apocalyptic number.

It is an amenable number.

261861448 is a deficient number, since it is larger than the sum of its proper divisors (229128782).

261861448 is a wasteful number, since it uses less digits than its factorization.

261861448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32732687 (or 32732683 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 261861448 is about 16182.1336046888. The cubic root of 261861448 is about 639.7699759301.

The spelling of 261861448 in words is "two hundred sixty-one million, eight hundred sixty-one thousand, four hundred forty-eight".