261775044 has 72 divisors (see below), whose sum is σ = 721032480. Its totient is φ = 82115712.

The previous prime is 261775043. The next prime is 261775069. The reversal of 261775044 is 440577162.

It is a super-3 number, since 3×261775044³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (261775043) 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, 27019 + ... + 35405.

It is an arithmetic number, because the mean of its divisors is an integer number (10014340).

Almost surely, 2^261775044 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 261775044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360516240).

261775044 is an abundant number, since it is smaller than the sum of its proper divisors (459257436).

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

261775044 is a wasteful number, since it uses less digits than its factorization.

261775044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8434 (or 8409 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 261775044 is about 16179.4636499484. The cubic root of 261775044 is about 639.6996018621.

The spelling of 261775044 in words is "two hundred sixty-one million, seven hundred seventy-five thousand, forty-four".