8128861 has 8 divisors (see below), whose sum is σ = 8878464. Its totient is φ = 7397040.

The previous prime is 8128829. The next prime is 8128871. The reversal of 8128861 is 1688218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8128861 - 2⁵ = 8128829 is a prime.

It is a Duffinian number.

8128861 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8128801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3481 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (1109808).

Almost surely, 2^8128861 is an apocalyptic number.

It is an amenable number.

8128861 is a deficient number, since it is larger than the sum of its proper divisors (749603).

8128861 is a wasteful number, since it uses less digits than its factorization.

8128861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891.

The product of its digits is 6144, while the sum is 34.

The square root of 8128861 is about 2851.1157465105. The cubic root of 8128861 is about 201.0681270347.

The spelling of 8128861 in words is "eight million, one hundred twenty-eight thousand, eight hundred sixty-one".