261588928 has 42 divisors (see below), whose sum is σ = 551460416. Its totient is φ = 123091968.

The previous prime is 261588893. The next prime is 261588931. The reversal of 261588928 is 829885162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11425 + ... + 25567.

Almost surely, 2^261588928 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 261588928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275730208).

261588928 is an abundant number, since it is smaller than the sum of its proper divisors (289871488).

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

261588928 is a wasteful number, since it uses less digits than its factorization.

261588928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14189 (or 14162 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 261588928 is about 16173.7110151010. The cubic root of 261588928 is about 639.5479620466.

The spelling of 261588928 in words is "two hundred sixty-one million, five hundred eighty-eight thousand, nine hundred twenty-eight".