261654878 has 8 divisors (see below), whose sum is σ = 406016280. Its totient is φ = 126316120.

The previous prime is 261654859. The next prime is 261654901. The reversal of 261654878 is 878456162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255588 + ... + 2255703.

It is an arithmetic number, because the mean of its divisors is an integer number (50752035).

Almost surely, 2^261654878 is an apocalyptic number.

261654878 is a deficient number, since it is larger than the sum of its proper divisors (144361402).

261654878 is a wasteful number, since it uses less digits than its factorization.

261654878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511322.

The product of its digits is 645120, while the sum is 47.

The square root of 261654878 is about 16175.7496889634. The cubic root of 261654878 is about 639.6017036739.

The spelling of 261654878 in words is "two hundred sixty-one million, six hundred fifty-four thousand, eight hundred seventy-eight".