261981704 has 8 divisors (see below), whose sum is σ = 491215710. Its totient is φ = 130990848.

The previous prime is 261981691. The next prime is 261981739. The reversal of 261981704 is 407189162.

It can be written as a sum of positive squares in only one way, i.e., 216148804 + 45832900 = 14702^2 + 6770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 16373849 + ... + 16373864.

Almost surely, 2^261981704 is an apocalyptic number.

It is an amenable number.

261981704 is a deficient number, since it is larger than the sum of its proper divisors (229234006).

261981704 is a wasteful number, since it uses less digits than its factorization.

261981704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32747719 (or 32747715 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 261981704 is about 16185.8488810442. The cubic root of 261981704 is about 639.8678959110.

The spelling of 261981704 in words is "two hundred sixty-one million, nine hundred eighty-one thousand, seven hundred four".