261020898 has 48 divisors (see below), whose sum is σ = 602908800. Its totient is φ = 81375840.

The previous prime is 261020861. The next prime is 261020923. The reversal of 261020898 is 898020162.

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 23 ways as a sum of consecutive naturals, for example, 22188 + ... + 31848.

It is an arithmetic number, because the mean of its divisors is an integer number (12560600).

Almost surely, 2^261020898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261020898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301454400).

261020898 is an abundant number, since it is smaller than the sum of its proper divisors (341887902).

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

261020898 is a wasteful number, since it uses less digits than its factorization.

261020898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9767 (or 9764 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 261020898 is about 16156.1411853202. The cubic root of 261020898 is about 639.0847088800.

The spelling of 261020898 in words is "two hundred sixty-one million, twenty thousand, eight hundred ninety-eight".