261878627 has 8 divisors (see below), whose sum is σ = 263733600. Its totient is φ = 260029440.

The previous prime is 261878623. The next prime is 261878629. The reversal of 261878627 is 726878162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261878627 - 2² = 261878623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261878623) 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 7 ways as a sum of consecutive naturals, for example, 126533 + ... + 128585.

It is an arithmetic number, because the mean of its divisors is an integer number (32966700).

Almost surely, 2^261878627 is an apocalyptic number.

261878627 is a deficient number, since it is larger than the sum of its proper divisors (1854973).

261878627 is a wasteful number, since it uses less digits than its factorization.

261878627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893.

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

The square root of 261878627 is about 16182.6643974347. The cubic root of 261878627 is about 639.7839659850.

The spelling of 261878627 in words is "two hundred sixty-one million, eight hundred seventy-eight thousand, six hundred twenty-seven".