261268998 has 8 divisors (see below), whose sum is σ = 522538008. Its totient is φ = 87089664.

The previous prime is 261268991. The next prime is 261268999. The reversal of 261268998 is 899862162.

261268998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

261268998 is an admirable number.

It is a super-2 number, since 2×261268998² = 136522978631848008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261268998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261268991) 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 3 ways as a sum of consecutive naturals, for example, 21772411 + ... + 21772422.

It is an arithmetic number, because the mean of its divisors is an integer number (65317251).

Almost surely, 2^261268998 is an apocalyptic number.

261268998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261268998 is a wasteful number, since it uses less digits than its factorization.

261268998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43544838.

The product of its digits is 746496, while the sum is 51.

The square root of 261268998 is about 16163.8175565056. The cubic root of 261268998 is about 639.2871278025.

The spelling of 261268998 in words is "two hundred sixty-one million, two hundred sixty-eight thousand, nine hundred ninety-eight".