261727266 has 16 divisors (see below), whose sum is σ = 527277024. Its totient is φ = 86605344.

The previous prime is 261727247. The next prime is 261727309. The reversal of 261727266 is 662727162.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158380 + ... + 160023.

It is an arithmetic number, because the mean of its divisors is an integer number (32954814).

Almost surely, 2^261727266 is an apocalyptic number.

261727266 is an abundant number, since it is smaller than the sum of its proper divisors (265549758).

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

261727266 is a wasteful number, since it uses less digits than its factorization.

261727266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318545.

The product of its digits is 84672, while the sum is 39.

The square root of 261727266 is about 16177.9870812163. The cubic root of 261727266 is about 639.6606811324.

The spelling of 261727266 in words is "two hundred sixty-one million, seven hundred twenty-seven thousand, two hundred sixty-six".