261894960 has 240 divisors, whose sum is σ = 917485920. Its totient is φ = 66908160.

The previous prime is 261894947. The next prime is 261894961. The reversal of 261894960 is 69498162.

It is a happy number.

261894960 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 (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (261894961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2942596 + ... + 2942684.

It is an arithmetic number, because the mean of its divisors is an integer number (3822858).

Almost surely, 2^261894960 is an apocalyptic number.

261894960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261894960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458742960).

261894960 is an abundant number, since it is smaller than the sum of its proper divisors (655590960).

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

261894960 is a wasteful number, since it uses less digits than its factorization.

261894960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 261894960 is about 16183.1690345247. The cubic root of 261894960 is about 639.7972665158.

The spelling of 261894960 in words is "two hundred sixty-one million, eight hundred ninety-four thousand, nine hundred sixty".