261025768 has 8 divisors (see below), whose sum is σ = 489423330. Its totient is φ = 130512880.

The previous prime is 261025741. The next prime is 261025783. The reversal of 261025768 is 867520162.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 178543044 + 82482724 = 13362^2 + 9082^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 16314103 + ... + 16314118.

Almost surely, 2^261025768 is an apocalyptic number.

It is an amenable number.

261025768 is a deficient number, since it is larger than the sum of its proper divisors (228397562).

261025768 is a wasteful number, since it uses less digits than its factorization.

261025768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32628227 (or 32628223 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 261025768 is about 16156.2919012996. The cubic root of 261025768 is about 639.0886834317.

The spelling of 261025768 in words is "two hundred sixty-one million, twenty-five thousand, seven hundred sixty-eight".