261669712 has 80 divisors (see below), whose sum is σ = 565892352. Its totient is φ = 116582400.

The previous prime is 261669703. The next prime is 261669713. The reversal of 261669712 is 217966162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261669713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944518 + ... + 944794.

Almost surely, 2^261669712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261669712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282946176).

261669712 is an abundant number, since it is smaller than the sum of its proper divisors (304222640).

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

261669712 is a wasteful number, since it uses less digits than its factorization.

261669712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 470 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 261669712 is about 16176.2082083534. The cubic root of 261669712 is about 639.6137904253.

The spelling of 261669712 in words is "two hundred sixty-one million, six hundred sixty-nine thousand, seven hundred twelve".