261305360 has 40 divisors (see below), whose sum is σ = 616615296. Its totient is φ = 102960000.

The previous prime is 261305357. The next prime is 261305389. The reversal of 261305360 is 63503162.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19016 + ... + 29735.

Almost surely, 2^261305360 is an apocalyptic number.

261305360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261305360 is an abundant number, since it is smaller than the sum of its proper divisors (355309936).

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

261305360 is a wasteful number, since it uses less digits than its factorization.

261305360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48831 (or 48825 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 261305360 is about 16164.9423135377. The cubic root of 261305360 is about 639.3167839301.

The spelling of 261305360 in words is "two hundred sixty-one million, three hundred five thousand, three hundred sixty".