261223460 has 12 divisors (see below), whose sum is σ = 548569308. Its totient is φ = 104489376.

The previous prime is 261223451. The next prime is 261223477. The reversal of 261223460 is 64322162.

261223460 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 2 ways, for example, as 26275876 + 234947584 = 5126^2 + 15328^2 .

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, 6530567 + ... + 6530606.

It is an arithmetic number, because the mean of its divisors is an integer number (45714109).

Almost surely, 2^261223460 is an apocalyptic number.

261223460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261223460 is an abundant number, since it is smaller than the sum of its proper divisors (287345848).

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

261223460 is a wasteful number, since it uses less digits than its factorization.

261223460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13061182 (or 13061180 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261223460 is about 16162.4088551181. The cubic root of 261223460 is about 639.2499840299.

The spelling of 261223460 in words is "two hundred sixty-one million, two hundred twenty-three thousand, four hundred sixty".