261995304 has 32 divisors (see below), whose sum is σ = 655784640. Its totient is φ = 87225600.

The previous prime is 261995287. The next prime is 261995311. The reversal of 261995304 is 403599162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14949 + ... + 27339.

It is an arithmetic number, because the mean of its divisors is an integer number (20493270).

Almost surely, 2^261995304 is an apocalyptic number.

261995304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261995304 is an abundant number, since it is smaller than the sum of its proper divisors (393789336).

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

261995304 is a wasteful number, since it uses less digits than its factorization.

261995304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13281 (or 13277 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 261995304 is about 16186.2689956642. The cubic root of 261995304 is about 639.8789679982.

The spelling of 261995304 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, three hundred four".