261630968 has 8 divisors (see below), whose sum is σ = 490558080. Its totient is φ = 130815480.

The previous prime is 261630947. The next prime is 261630983. The reversal of 261630968 is 869036162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16351928 + ... + 16351943.

It is an arithmetic number, because the mean of its divisors is an integer number (61319760).

Almost surely, 2^261630968 is an apocalyptic number.

It is an amenable number.

261630968 is a deficient number, since it is larger than the sum of its proper divisors (228927112).

261630968 is a wasteful number, since it uses less digits than its factorization.

261630968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32703877 (or 32703873 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 261630968 is about 16175.0106027786. The cubic root of 261630968 is about 639.5822208311.

The spelling of 261630968 in words is "two hundred sixty-one million, six hundred thirty thousand, nine hundred sixty-eight".