261875656 has 16 divisors (see below), whose sum is σ = 561162240. Its totient is φ = 112232400.

The previous prime is 261875639. The next prime is 261875659. The reversal of 261875656 is 656578162.

It is not an unprimeable number, because it can be changed into a prime (261875659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2338120 + ... + 2338231.

It is an arithmetic number, because the mean of its divisors is an integer number (35072640).

Almost surely, 2^261875656 is an apocalyptic number.

It is an amenable number.

261875656 is an abundant number, since it is smaller than the sum of its proper divisors (299286584).

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

261875656 is a wasteful number, since it uses less digits than its factorization.

261875656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676364 (or 4676360 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 261875656 is about 16182.5726014129. The cubic root of 261875656 is about 639.7815465367.

The spelling of 261875656 in words is "two hundred sixty-one million, eight hundred seventy-five thousand, six hundred fifty-six".