261976766 has 12 divisors (see below), whose sum is σ = 417441408. Its totient is φ = 123282912.

The previous prime is 261976763. The next prime is 261976811. The reversal of 261976766 is 667679162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261976763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226046 + ... + 227201.

It is an arithmetic number, because the mean of its divisors is an integer number (34786784).

Almost surely, 2^261976766 is an apocalyptic number.

261976766 is a deficient number, since it is larger than the sum of its proper divisors (155464642).

261976766 is a wasteful number, since it uses less digits than its factorization.

261976766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453283 (or 453266 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 50.

The square root of 261976766 is about 16185.6963396698. The cubic root of 261976766 is about 639.8638756716.

The spelling of 261976766 in words is "two hundred sixty-one million, nine hundred seventy-six thousand, seven hundred sixty-six".