261486992 has 80 divisors (see below), whose sum is σ = 570557232. Its totient is φ = 115292160.

The previous prime is 261486989. The next prime is 261487003. The reversal of 261486992 is 299684162.

It can be written as a sum of positive squares in 8 ways, for example, as 62789776 + 198697216 = 7924^2 + 14096^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469178 + ... + 469734.

Almost surely, 2^261486992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261486992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285278616).

261486992 is an abundant number, since it is smaller than the sum of its proper divisors (309070240).

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

261486992 is a wasteful number, since it uses less digits than its factorization.

261486992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 670 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 261486992 is about 16170.5594213682. The cubic root of 261486992 is about 639.4648782153.

The spelling of 261486992 in words is "two hundred sixty-one million, four hundred eighty-six thousand, nine hundred ninety-two".