261342320 has 20 divisors (see below), whose sum is σ = 607621080. Its totient is φ = 104536896.

The previous prime is 261342313. The next prime is 261342331. The reversal of 261342320 is 23243162.

261342320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1633310 + ... + 1633469.

It is an arithmetic number, because the mean of its divisors is an integer number (30381054).

Almost surely, 2^261342320 is an apocalyptic number.

261342320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261342320 is an abundant number, since it is smaller than the sum of its proper divisors (346278760).

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

261342320 is a wasteful number, since it uses less digits than its factorization.

261342320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266792 (or 3266786 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 261342320 is about 16166.0854878353. The cubic root of 261342320 is about 639.3469249553.

Adding to 261342320 its reverse (23243162), we get a palindrome (284585482).

The spelling of 261342320 in words is "two hundred sixty-one million, three hundred forty-two thousand, three hundred twenty".