261043776 has 168 divisors, whose sum is σ = 893003040. Its totient is φ = 74559744.

The previous prime is 261043771. The next prime is 261043837. The reversal of 261043776 is 677340162.

261043776 is a `hidden beast` number, since 2 + 610 + 4 + 37 + 7 + 6 = 666.

261043776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (168).

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

It is a self number, because there is not a number n which added to its sum of digits gives 261043776.

It is not an unprimeable number, because it can be changed into a prime (261043771) 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, 83131 + ... + 86213.

Almost surely, 2^261043776 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 261043776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446501520).

261043776 is an abundant number, since it is smaller than the sum of its proper divisors (631959264).

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

261043776 is a wasteful number, since it uses less digits than its factorization.

261043776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118 (or 3095 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 261043776 is about 16156.8491977861. The cubic root of 261043776 is about 639.1033798663.

The spelling of 261043776 in words is "two hundred sixty-one million, forty-three thousand, seven hundred seventy-six".