261775028 has 12 divisors (see below), whose sum is σ = 463626240. Its totient is φ = 129310392.

The previous prime is 261775001. The next prime is 261775039. The reversal of 261775028 is 820577162.

261775028 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261774982 and 261775000.

It is a congruent number.

It is an unprimeable number.

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, 393908 + ... + 394571.

It is an arithmetic number, because the mean of its divisors is an integer number (38635520).

Almost surely, 2^261775028 is an apocalyptic number.

It is an amenable number.

261775028 is a deficient number, since it is larger than the sum of its proper divisors (201851212).

261775028 is a wasteful number, since it uses less digits than its factorization.

261775028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788566 (or 788564 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 261775028 is about 16179.4631554944. The cubic root of 261775028 is about 639.6995888290.

The spelling of 261775028 in words is "two hundred sixty-one million, seven hundred seventy-five thousand, twenty-eight".