261201688 has 16 divisors (see below), whose sum is σ = 534276360. Its totient is φ = 118728000.

The previous prime is 261201679. The next prime is 261201727. The reversal of 261201688 is 886102162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484013 + ... + 1484188.

Almost surely, 2^261201688 is an apocalyptic number.

It is an amenable number.

261201688 is an abundant number, since it is smaller than the sum of its proper divisors (273074672).

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

261201688 is a wasteful number, since it uses less digits than its factorization.

261201688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968218 (or 2968214 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 261201688 is about 16161.7353028689. The cubic root of 261201688 is about 639.2322238367.

The spelling of 261201688 in words is "two hundred sixty-one million, two hundred one thousand, six hundred eighty-eight".