261716860 has 12 divisors (see below), whose sum is σ = 549605448. Its totient is φ = 104686736.

The previous prime is 261716857. The next prime is 261716893. The reversal of 261716860 is 68617162.

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, 6542902 + ... + 6542941.

It is an arithmetic number, because the mean of its divisors is an integer number (45800454).

Almost surely, 2^261716860 is an apocalyptic number.

261716860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261716860 is an abundant number, since it is smaller than the sum of its proper divisors (287888588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261716860 is a wasteful number, since it uses less digits than its factorization.

261716860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13085852 (or 13085850 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 261716860 is about 16177.6654681694. The cubic root of 261716860 is about 639.6522036087.

The spelling of 261716860 in words is "two hundred sixty-one million, seven hundred sixteen thousand, eight hundred sixty".