261870592 has 22 divisors (see below), whose sum is σ = 523487498. Its totient is φ = 130934784.

The previous prime is 261870569. The next prime is 261870611. The reversal of 261870592 is 295078162.

It can be written as a sum of positive squares in only one way, i.e., 237899776 + 23970816 = 15424^2 + 4896^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126843 + ... + 128890.

Almost surely, 2^261870592 is an apocalyptic number.

It is an amenable number.

261870592 is a deficient number, since it is larger than the sum of its proper divisors (261616906).

261870592 is an equidigital number, since it uses as much as digits as its factorization.

261870592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255753 (or 255735 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 261870592 is about 16182.4161360410. The cubic root of 261870592 is about 639.7774226016. Note that the first 3 decimals are identical.

The spelling of 261870592 in words is "two hundred sixty-one million, eight hundred seventy thousand, five hundred ninety-two".