261130860 has 36 divisors (see below), whose sum is σ = 792097488. Its totient is φ = 69634848.

The previous prime is 261130843. The next prime is 261130901. The reversal of 261130860 is 68031162.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725184 + ... + 725543.

It is an arithmetic number, because the mean of its divisors is an integer number (22002708).

Almost surely, 2^261130860 is an apocalyptic number.

261130860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261130860 is an abundant number, since it is smaller than the sum of its proper divisors (530966628).

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

261130860 is a wasteful number, since it uses less digits than its factorization.

261130860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450742 (or 1450737 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 261130860 is about 16159.5439292079. The cubic root of 261130860 is about 639.1744400946.

The spelling of 261130860 in words is "two hundred sixty-one million, one hundred thirty thousand, eight hundred sixty".