261223064 has 16 divisors (see below), whose sum is σ = 492117720. Its totient is φ = 129991680.

The previous prime is 261223063. The next prime is 261223069. The reversal of 261223064 is 460322162.

261223064 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 (261223063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75689 + ... + 79064.

Almost surely, 2^261223064 is an apocalyptic number.

It is an amenable number.

261223064 is a deficient number, since it is larger than the sum of its proper divisors (230894656).

261223064 is a wasteful number, since it uses less digits than its factorization.

261223064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154970 (or 154966 counting only the distinct ones).

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

The square root of 261223064 is about 16162.3966044643. The cubic root of 261223064 is about 639.2496610074.

The spelling of 261223064 in words is "two hundred sixty-one million, two hundred twenty-three thousand, sixty-four".