8278861 has 4 divisors (see below), whose sum is σ = 8502652. Its totient is φ = 8055072.

The previous prime is 8278849. The next prime is 8278867. The reversal of 8278861 is 1688728.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4202500 + 4076361 = 2050^2 + 2019^2 .

It is a cyclic number.

It is not a de Polignac number, because 8278861 - 2¹⁹ = 7754573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278867) 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, 111840 + ... + 111913.

It is an arithmetic number, because the mean of its divisors is an integer number (2125663).

Almost surely, 2^8278861 is an apocalyptic number.

It is an amenable number.

8278861 is a deficient number, since it is larger than the sum of its proper divisors (223791).

8278861 is a wasteful number, since it uses less digits than its factorization.

8278861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223790.

The product of its digits is 43008, while the sum is 40.

The square root of 8278861 is about 2877.3009922495. The cubic root of 8278861 is about 202.2973515052.

The spelling of 8278861 in words is "eight million, two hundred seventy-eight thousand, eight hundred sixty-one".