261928895 has 4 divisors (see below), whose sum is σ = 314314680. Its totient is φ = 209543112.

The previous prime is 261928819. The next prime is 261928903. The reversal of 261928895 is 598829162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261928895 - 2¹⁰ = 261927871 is a prime.

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, 26192885 + ... + 26192894.

It is an arithmetic number, because the mean of its divisors is an integer number (78578670).

Almost surely, 2^261928895 is an apocalyptic number.

261928895 is a deficient number, since it is larger than the sum of its proper divisors (52385785).

261928895 is an equidigital number, since it uses as much as digits as its factorization.

261928895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52385784.

The product of its digits is 622080, while the sum is 50.

The square root of 261928895 is about 16184.2174664084. The cubic root of 261928895 is about 639.8248992005.

The spelling of 261928895 in words is "two hundred sixty-one million, nine hundred twenty-eight thousand, eight hundred ninety-five".