261603304 has 8 divisors (see below), whose sum is σ = 490506210. Its totient is φ = 130801648.

The previous prime is 261603257. The next prime is 261603347. The reversal of 261603304 is 403306162.

It can be written as a sum of positive squares in only one way, i.e., 178756900 + 82846404 = 13370^2 + 9102^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16350199 + ... + 16350214.

Almost surely, 2^261603304 is an apocalyptic number.

It is an amenable number.

261603304 is a deficient number, since it is larger than the sum of its proper divisors (228902906).

261603304 is a wasteful number, since it uses less digits than its factorization.

261603304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32700419 (or 32700415 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 261603304 is about 16174.1554339013. The cubic root of 261603304 is about 639.5596775948.

Adding to 261603304 its reverse (403306162), we get a palindrome (664909466).

The spelling of 261603304 in words is "two hundred sixty-one million, six hundred three thousand, three hundred four".