261078278 has 8 divisors (see below), whose sum is σ = 412228920. Its totient is φ = 123668640.

The previous prime is 261078263. The next prime is 261078287. The reversal of 261078278 is 872870162.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3435203 + ... + 3435278.

It is an arithmetic number, because the mean of its divisors is an integer number (51528615).

Almost surely, 2^261078278 is an apocalyptic number.

261078278 is a deficient number, since it is larger than the sum of its proper divisors (151150642).

261078278 is a wasteful number, since it uses less digits than its factorization.

261078278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870502.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 261078278 is about 16157.9168830639. The cubic root of 261078278 is about 639.1315352633.

The spelling of 261078278 in words is "two hundred sixty-one million, seventy-eight thousand, two hundred seventy-eight".