261536324 has 18 divisors (see below), whose sum is σ = 532413630. Its totient is φ = 112086912.

The previous prime is 261536323. The next prime is 261536339. The reversal of 261536324 is 423635162.

It can be written as a sum of positive squares in only one way, i.e., 154206724 + 107329600 = 12418^2 + 10360^2 .

It is not an unprimeable number, because it can be changed into a prime (261536323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666989 + ... + 667380.

It is an arithmetic number, because the mean of its divisors is an integer number (29578535).

Almost surely, 2^261536324 is an apocalyptic number.

It is an amenable number.

261536324 is an abundant number, since it is smaller than the sum of its proper divisors (270877306).

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

261536324 is a wasteful number, since it uses less digits than its factorization.

261536324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334387 (or 1334378 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 261536324 is about 16172.0847140992. The cubic root of 261536324 is about 639.5050893906.

The spelling of 261536324 in words is "two hundred sixty-one million, five hundred thirty-six thousand, three hundred twenty-four".