261075552 has 96 divisors (see below), whose sum is σ = 726856704. Its totient is φ = 81907200.

The previous prime is 261075497. The next prime is 261075559. The reversal of 261075552 is 255570162.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261075559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108927 + ... + 111297.

It is an arithmetic number, because the mean of its divisors is an integer number (7571424).

Almost surely, 2^261075552 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 261075552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363428352).

261075552 is an abundant number, since it is smaller than the sum of its proper divisors (465781152).

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

261075552 is a wasteful number, since it uses less digits than its factorization.

261075552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 261075552 is about 16157.8325279104. The cubic root of 261075552 is about 639.1293107981.

The spelling of 261075552 in words is "two hundred sixty-one million, seventy-five thousand, five hundred fifty-two".