261857060 has 24 divisors (see below), whose sum is σ = 550307520. Its totient is φ = 104665184.

The previous prime is 261857041. The next prime is 261857077. The reversal of 261857060 is 60758162.

It is a self number, because there is not a number n which added to its sum of digits gives 261857060.

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 7 ways as a sum of consecutive naturals, for example, 28337 + ... + 36423.

It is an arithmetic number, because the mean of its divisors is an integer number (22929480).

Almost surely, 2^261857060 is an apocalyptic number.

261857060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261857060 is an abundant number, since it is smaller than the sum of its proper divisors (288450460).

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

261857060 is a wasteful number, since it uses less digits than its factorization.

261857060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9715 (or 9713 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 261857060 is about 16181.9980224940. The cubic root of 261857060 is about 639.7664023783.

The spelling of 261857060 in words is "two hundred sixty-one million, eight hundred fifty-seven thousand, sixty".