261207560 has 16 divisors (see below), whose sum is σ = 587717100. Its totient is φ = 104483008.

The previous prime is 261207559. The next prime is 261207629. The reversal of 261207560 is 65702162.

It can be written as a sum of positive squares in 2 ways, for example, as 250462276 + 10745284 = 15826^2 + 3278^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3265055 + ... + 3265134.

Almost surely, 2^261207560 is an apocalyptic number.

261207560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261207560 is an abundant number, since it is smaller than the sum of its proper divisors (326509540).

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

261207560 is a wasteful number, since it uses less digits than its factorization.

261207560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530200 (or 6530196 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261207560 is about 16161.9169655088. The cubic root of 261207560 is about 639.2370139327.

The spelling of 261207560 in words is "two hundred sixty-one million, two hundred seven thousand, five hundred sixty".