861280455 has 32 divisors (see below), whose sum is σ = 1580571648. Its totient is φ = 392313600.

The previous prime is 861280451. The next prime is 861280457. The reversal of 861280455 is 554082168.

861280455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861280455 - 2² = 861280451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861280451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14910 + ... + 44100.

It is an arithmetic number, because the mean of its divisors is an integer number (49392864).

Almost surely, 2^861280455 is an apocalyptic number.

861280455 is a deficient number, since it is larger than the sum of its proper divisors (719291193).

861280455 is a wasteful number, since it uses less digits than its factorization.

861280455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29487.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 861280455 is about 29347.5800535581. The cubic root of 861280455 is about 951.4402733181.

The spelling of 861280455 in words is "eight hundred sixty-one million, two hundred eighty thousand, four hundred fifty-five".