261323268 has 24 divisors (see below), whose sum is σ = 619752000. Its totient is φ = 85679520.

The previous prime is 261323261. The next prime is 261323281. The reversal of 261323268 is 862323162.

It is a happy number.

261323268 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261323261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177768 + ... + 179231.

It is an arithmetic number, because the mean of its divisors is an integer number (25823000).

Almost surely, 2^261323268 is an apocalyptic number.

It is an amenable number.

261323268 is an abundant number, since it is smaller than the sum of its proper divisors (358428732).

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

261323268 is a wasteful number, since it uses less digits than its factorization.

261323268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357067 (or 357065 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 261323268 is about 16165.4962187989. The cubic root of 261323268 is about 639.3313883293.

The spelling of 261323268 in words is "two hundred sixty-one million, three hundred twenty-three thousand, two hundred sixty-eight".