261745772 has 12 divisors (see below), whose sum is σ = 472831296. Its totient is φ = 126651120.

The previous prime is 261745769. The next prime is 261745777. The reversal of 261745772 is 277547162.

It is not an unprimeable number, because it can be changed into a prime (261745777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055303 + ... + 1055550.

It is an arithmetic number, because the mean of its divisors is an integer number (39402608).

Almost surely, 2^261745772 is an apocalyptic number.

It is an amenable number.

261745772 is a deficient number, since it is larger than the sum of its proper divisors (211085524).

261745772 is a wasteful number, since it uses less digits than its factorization.

261745772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110888 (or 2110886 counting only the distinct ones).

The product of its digits is 164640, while the sum is 41.

The square root of 261745772 is about 16178.5590211242. The cubic root of 261745772 is about 639.6757569806.

The spelling of 261745772 in words is "two hundred sixty-one million, seven hundred forty-five thousand, seven hundred seventy-two".