261960912 has 120 divisors (see below), whose sum is σ = 778194240. Its totient is φ = 84369600.

The previous prime is 261960911. The next prime is 261960913. The reversal of 261960912 is 219069162.

261960912 is a `hidden beast` number, since 26 + 19 + 609 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (261960911) and next prime (261960913).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261960911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414837 + ... + 415467.

It is an arithmetic number, because the mean of its divisors is an integer number (6484952).

Almost surely, 2^261960912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261960912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389097120).

261960912 is an abundant number, since it is smaller than the sum of its proper divisors (516233328).

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

261960912 is a wasteful number, since it uses less digits than its factorization.

261960912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 261960912 is about 16185.2065788485. The cubic root of 261960912 is about 639.8509679029.

The spelling of 261960912 in words is "two hundred sixty-one million, nine hundred sixty thousand, nine hundred twelve".