261256648 has 16 divisors (see below), whose sum is σ = 501248880. Its totient is φ = 127590288.

The previous prime is 261256643. The next prime is 261256649. The reversal of 261256648 is 846652162.

261256648 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261256648² = 136510072248391808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261256648.

It is not an unprimeable number, because it can be changed into a prime (261256643) 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, 379390 + ... + 380077.

It is an arithmetic number, because the mean of its divisors is an integer number (31328055).

Almost surely, 2^261256648 is an apocalyptic number.

It is an amenable number.

261256648 is a deficient number, since it is larger than the sum of its proper divisors (239992232).

261256648 is a wasteful number, since it uses less digits than its factorization.

261256648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759516 (or 759512 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 261256648 is about 16163.4355259023. The cubic root of 261256648 is about 639.2770547609.

The spelling of 261256648 in words is "two hundred sixty-one million, two hundred fifty-six thousand, six hundred forty-eight".