261507860 has 24 divisors (see below), whose sum is σ = 564010440. Its totient is φ = 101775744.

The previous prime is 261507817. The next prime is 261507871. The reversal of 261507860 is 68705162.

261507860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 80928016 + 180579844 = 8996^2 + 13438^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261507860.

It is a congruent number.

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, 175955 + ... + 177434.

It is an arithmetic number, because the mean of its divisors is an integer number (23500435).

Almost surely, 2^261507860 is an apocalyptic number.

261507860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261507860 is an abundant number, since it is smaller than the sum of its proper divisors (302502580).

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

261507860 is a wasteful number, since it uses less digits than its factorization.

261507860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353435 (or 353433 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 261507860 is about 16171.2046551888. The cubic root of 261507860 is about 639.4818886193.

The spelling of 261507860 in words is "two hundred sixty-one million, five hundred seven thousand, eight hundred sixty".