261623260 has 24 divisors (see below), whose sum is σ = 567133056. Its totient is φ = 101273280.

The previous prime is 261623231. The next prime is 261623261. The reversal of 261623260 is 62326162.

It is a happy number.

261623260 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261623261) 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, 210367 + ... + 211606.

It is an arithmetic number, because the mean of its divisors is an integer number (23630544).

Almost surely, 2^261623260 is an apocalyptic number.

261623260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261623260 is an abundant number, since it is smaller than the sum of its proper divisors (305509796).

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

261623260 is a wasteful number, since it uses less digits than its factorization.

261623260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422013 (or 422011 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 261623260 is about 16174.7723322463. The cubic root of 261623260 is about 639.5759397854.

The spelling of 261623260 in words is "two hundred sixty-one million, six hundred twenty-three thousand, two hundred sixty".