261878276 has 36 divisors (see below), whose sum is σ = 522677904. Its totient is φ = 113850000.

The previous prime is 261878269. The next prime is 261878303. The reversal of 261878276 is 672878162.

It is a self number, because there is not a number n which added to its sum of digits gives 261878276.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17651 + ... + 28901.

Almost surely, 2^261878276 is an apocalyptic number.

It is an amenable number.

261878276 is a deficient number, since it is larger than the sum of its proper divisors (260799628).

261878276 is a wasteful number, since it uses less digits than its factorization.

261878276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11312 (or 11287 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 261878276 is about 16182.6535524926. The cubic root of 261878276 is about 639.7836801474.

The spelling of 261878276 in words is "two hundred sixty-one million, eight hundred seventy-eight thousand, two hundred seventy-six".