261107730 has 192 divisors, whose sum is σ = 790013952. Its totient is φ = 59304960.

The previous prime is 261107711. The next prime is 261107741. The reversal of 261107730 is 37701162.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261107694 and 261107703.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 834054 + ... + 834366.

It is an arithmetic number, because the mean of its divisors is an integer number (4114656).

Almost surely, 2^261107730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261107730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395006976).

261107730 is an abundant number, since it is smaller than the sum of its proper divisors (528906222).

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

261107730 is a wasteful number, since it uses less digits than its factorization.

261107730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 261107730 is about 16158.8282372207. The cubic root of 261107730 is about 639.1555676395.

Adding to 261107730 its reverse (37701162), we get a palindrome (298808892).

The spelling of 261107730 in words is "two hundred sixty-one million, one hundred seven thousand, seven hundred thirty".