261386070 has 64 divisors (see below), whose sum is σ = 701084160. Its totient is φ = 61817600.

The previous prime is 261386039. The next prime is 261386113. The reversal of 261386070 is 70683162.

261386070 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 3871 + ... + 23189.

It is an arithmetic number, because the mean of its divisors is an integer number (10954440).

Almost surely, 2^261386070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261386070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350542080).

261386070 is an abundant number, since it is smaller than the sum of its proper divisors (439698090).

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

261386070 is a wasteful number, since it uses less digits than its factorization.

261386070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19381.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 261386070 is about 16167.4385726373. The cubic root of 261386070 is about 639.3825995796.

The spelling of 261386070 in words is "two hundred sixty-one million, three hundred eighty-six thousand, seventy".