261258798 has 16 divisors (see below), whose sum is σ = 534669696. Its totient is φ = 85060920.

The previous prime is 261258769. The next prime is 261258827. The reversal of 261258798 is 897852162.

It is an interprime number because it is at equal distance from previous prime (261258769) and next prime (261258827).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506058 + ... + 506573.

It is an arithmetic number, because the mean of its divisors is an integer number (33416856).

Almost surely, 2^261258798 is an apocalyptic number.

261258798 is an abundant number, since it is smaller than the sum of its proper divisors (273410898).

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

261258798 is a wasteful number, since it uses less digits than its factorization.

261258798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012679.

The product of its digits is 483840, while the sum is 48.

The square root of 261258798 is about 16163.5020339034. The cubic root of 261258798 is about 639.2788083901.

The spelling of 261258798 in words is "two hundred sixty-one million, two hundred fifty-eight thousand, seven hundred ninety-eight".