261412740 has 72 divisors (see below), whose sum is σ = 839606040. Its totient is φ = 65608704.

The previous prime is 261412709. The next prime is 261412741. The reversal of 261412740 is 47214162.

261412740 is a `hidden beast` number, since 2 + 614 + 1 + 2 + 7 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3617604 + 257795136 = 1902^2 + 16056^2 .

It is not an unprimeable number, because it can be changed into a prime (261412741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39655 + ... + 45774.

It is an arithmetic number, because the mean of its divisors is an integer number (11661195).

Almost surely, 2^261412740 is an apocalyptic number.

261412740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261412740 is an abundant number, since it is smaller than the sum of its proper divisors (578193300).

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

261412740 is a wasteful number, since it uses less digits than its factorization.

261412740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85461 (or 85456 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 261412740 is about 16168.2633575780. The cubic root of 261412740 is about 639.4043448777.

The spelling of 261412740 in words is "two hundred sixty-one million, four hundred twelve thousand, seven hundred forty".