261603696 has 40 divisors (see below), whose sum is σ = 676412560. Its totient is φ = 87123456.

The previous prime is 261603677. The next prime is 261603697. The reversal of 261603696 is 696306162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261603697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82590 + ... + 85698.

It is an arithmetic number, because the mean of its divisors is an integer number (16910314).

Almost surely, 2^261603696 is an apocalyptic number.

It is an amenable number.

261603696 is an abundant number, since it is smaller than the sum of its proper divisors (414808864).

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

261603696 is a wasteful number, since it uses less digits than its factorization.

261603696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4873 (or 4867 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 261603696 is about 16174.1675519948. The cubic root of 261603696 is about 639.5599970444.

The spelling of 261603696 in words is "two hundred sixty-one million, six hundred three thousand, six hundred ninety-six".