261892998 has 48 divisors (see below), whose sum is σ = 599192880. Its totient is φ = 82441152.

The previous prime is 261892987. The next prime is 261892999. The reversal of 261892998 is 899298162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261892999) 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, 126540 + ... + 128592.

It is an arithmetic number, because the mean of its divisors is an integer number (12483185).

Almost surely, 2^261892998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261892998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299596440).

261892998 is an abundant number, since it is smaller than the sum of its proper divisors (337299882).

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

261892998 is a wasteful number, since it uses less digits than its factorization.

261892998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453 (or 2450 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 261892998 is about 16183.1084158761. The cubic root of 261892998 is about 639.7956688201.

The spelling of 261892998 in words is "two hundred sixty-one million, eight hundred ninety-two thousand, nine hundred ninety-eight".