261269764 has 36 divisors (see below), whose sum is σ = 534284940. Its totient is φ = 111464640.

The previous prime is 261269761. The next prime is 261269777. The reversal of 261269764 is 467962162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 235868164 + 25401600 = 15358^2 + 5040^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261269764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261269761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41974 + ... + 47794.

Almost surely, 2^261269764 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 261269764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267142470).

261269764 is an abundant number, since it is smaller than the sum of its proper divisors (273015176).

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

261269764 is a wasteful number, since it uses less digits than its factorization.

261269764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6068 (or 6059 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 261269764 is about 16163.8412513858. The cubic root of 261269764 is about 639.2877525653.

The spelling of 261269764 in words is "two hundred sixty-one million, two hundred sixty-nine thousand, seven hundred sixty-four".