261299768 has 24 divisors (see below), whose sum is σ = 496911600. Its totient is φ = 128795472.

The previous prime is 261299767. The next prime is 261299771. The reversal of 261299768 is 867992162.

It is a happy number.

It is a super-3 number, since 3×261299768³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261299767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406055 + ... + 406697.

It is an arithmetic number, because the mean of its divisors is an integer number (20704650).

Almost surely, 2^261299768 is an apocalyptic number.

It is an amenable number.

261299768 is a deficient number, since it is larger than the sum of its proper divisors (235611832).

261299768 is an frugal number, since it uses more digits than its factorization.

261299768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 724 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 261299768 is about 16164.7693457098. The cubic root of 261299768 is about 639.3122233845.

The spelling of 261299768 in words is "two hundred sixty-one million, two hundred ninety-nine thousand, seven hundred sixty-eight".