261748572 has 12 divisors (see below), whose sum is σ = 610746696. Its totient is φ = 87249520.

The previous prime is 261748559. The next prime is 261748601. The reversal of 261748572 is 275847162.

261748572 is digitally balanced in base 3, 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 (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10906179 + ... + 10906202.

It is an arithmetic number, because the mean of its divisors is an integer number (50895558).

Almost surely, 2^261748572 is an apocalyptic number.

It is an amenable number.

261748572 is an abundant number, since it is smaller than the sum of its proper divisors (348998124).

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

261748572 is a wasteful number, since it uses less digits than its factorization.

261748572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21812388 (or 21812386 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 261748572 is about 16178.6455551755. The cubic root of 261748572 is about 639.6780379289.

The spelling of 261748572 in words is "two hundred sixty-one million, seven hundred forty-eight thousand, five hundred seventy-two".