261788338 has 48 divisors (see below), whose sum is σ = 482751360. Its totient is φ = 104265216.

The previous prime is 261788309. The next prime is 261788339. The reversal of 261788338 is 833887162.

It is not an unprimeable number, because it can be changed into a prime (261788339) 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, 359731 + ... + 360457.

It is an arithmetic number, because the mean of its divisors is an integer number (10057320).

Almost surely, 2^261788338 is an apocalyptic number.

261788338 is a deficient number, since it is larger than the sum of its proper divisors (220963022).

261788338 is a wasteful number, since it uses less digits than its factorization.

261788338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 842 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 261788338 is about 16179.8744741732. The cubic root of 261788338 is about 639.7104305268.

The spelling of 261788338 in words is "two hundred sixty-one million, seven hundred eighty-eight thousand, three hundred thirty-eight".