261085870 has 16 divisors (see below), whose sum is σ = 470163600. Its totient is φ = 104387904.

The previous prime is 261085831. The next prime is 261085871. The reversal of 261085870 is 78580162.

It is a super-4 number, since 4×261085870⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261085871) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 26209 + ... + 34771.

It is an arithmetic number, because the mean of its divisors is an integer number (29385225).

Almost surely, 2^261085870 is an apocalyptic number.

261085870 is a deficient number, since it is larger than the sum of its proper divisors (209077730).

261085870 is a wasteful number, since it uses less digits than its factorization.

261085870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11619.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 261085870 is about 16158.1518126301. The cubic root of 261085870 is about 639.1377303907.

The spelling of 261085870 in words is "two hundred sixty-one million, eighty-five thousand, eight hundred seventy".