8278645 has 8 divisors (see below), whose sum is σ = 9961560. Its totient is φ = 6604800.

The previous prime is 8278637. The next prime is 8278649. The reversal of 8278645 is 5468728.

It can be written as a sum of positive squares in 4 ways, for example, as 3363556 + 4915089 = 1834^2 + 2217^2 .

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

It is not a de Polignac number, because 8278645 - 2³ = 8278637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8278598 and 8278607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278649) 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, 60 + ... + 4069.

It is an arithmetic number, because the mean of its divisors is an integer number (1245195).

Almost surely, 2^8278645 is an apocalyptic number.

It is an amenable number.

8278645 is a deficient number, since it is larger than the sum of its proper divisors (1682915).

8278645 is a wasteful number, since it uses less digits than its factorization.

8278645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535.

The product of its digits is 107520, while the sum is 40.

The square root of 8278645 is about 2877.2634568284. The cubic root of 8278645 is about 202.2955921404.

The spelling of 8278645 in words is "eight million, two hundred seventy-eight thousand, six hundred forty-five".