261686870 has 32 divisors (see below), whose sum is σ = 493387200. Its totient is φ = 99742720.

The previous prime is 261686837. The next prime is 261686881. The reversal of 261686870 is 78686162.

261686870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62606 + ... + 66654.

It is an arithmetic number, because the mean of its divisors is an integer number (15418350).

Almost surely, 2^261686870 is an apocalyptic number.

261686870 is a deficient number, since it is larger than the sum of its proper divisors (231700330).

261686870 is a wasteful number, since it uses less digits than its factorization.

261686870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 261686870 is about 16176.7385464438. The cubic root of 261686870 is about 639.6277702034.

The spelling of 261686870 in words is "two hundred sixty-one million, six hundred eighty-six thousand, eight hundred seventy".