261264340 has 12 divisors (see below), whose sum is σ = 548655156. Its totient is φ = 104505728.

The previous prime is 261264317. The next prime is 261264371. The reversal of 261264340 is 43462162.

261264340 is digitally balanced in base 3, 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 2 ways, for example, as 101848464 + 159415876 = 10092^2 + 12626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261264299 and 261264308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6531589 + ... + 6531628.

It is an arithmetic number, because the mean of its divisors is an integer number (45721263).

Almost surely, 2^261264340 is an apocalyptic number.

261264340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261264340 is an abundant number, since it is smaller than the sum of its proper divisors (287390816).

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

261264340 is a wasteful number, since it uses less digits than its factorization.

261264340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13063226 (or 13063224 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 261264340 is about 16163.6734686147. The cubic root of 261264340 is about 639.2833286310.

The spelling of 261264340 in words is "two hundred sixty-one million, two hundred sixty-four thousand, three hundred forty".