261593720 has 32 divisors (see below), whose sum is σ = 614178720. Its totient is φ = 100087680.

The previous prime is 261593719. The next prime is 261593723. The reversal of 261593720 is 27395162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261593723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141251 + ... + 143090.

It is an arithmetic number, because the mean of its divisors is an integer number (19193085).

Almost surely, 2^261593720 is an apocalyptic number.

261593720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261593720 is an abundant number, since it is smaller than the sum of its proper divisors (352585000).

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

261593720 is a wasteful number, since it uses less digits than its factorization.

261593720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284375 (or 284371 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 261593720 is about 16173.8591560580. The cubic root of 261593720 is about 639.5518672770.

The spelling of 261593720 in words is "two hundred sixty-one million, five hundred ninety-three thousand, seven hundred twenty".