261871078 has 8 divisors (see below), whose sum is σ = 448921872. Its totient is φ = 112230456.

The previous prime is 261871067. The next prime is 261871081. The reversal of 261871078 is 870178162.

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

It is a super-2 number, since 2×261871078² = 137152922985764168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261871078.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9352525 + ... + 9352552.

It is an arithmetic number, because the mean of its divisors is an integer number (56115234).

Almost surely, 2^261871078 is an apocalyptic number.

261871078 is a deficient number, since it is larger than the sum of its proper divisors (187050794).

261871078 is a wasteful number, since it uses less digits than its factorization.

261871078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18705086.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 261871078 is about 16182.4311523331. The cubic root of 261871078 is about 639.7778183844. Note that the first 3 decimals are identical.

The spelling of 261871078 in words is "two hundred sixty-one million, eight hundred seventy-one thousand, seventy-eight".