8266640 has 20 divisors (see below), whose sum is σ = 19220124. Its totient is φ = 3306624.

The previous prime is 8266633. The next prime is 8266663. The reversal of 8266640 is 466628.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5550736 + 2715904 = 2356^2 + 1648^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 8266597 and 8266606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51587 + ... + 51746.

Almost surely, 2^8266640 is an apocalyptic number.

8266640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8266640 is an abundant number, since it is smaller than the sum of its proper divisors (10953484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8266640 is a wasteful number, since it uses less digits than its factorization.

8266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103346 (or 103340 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 8266640 is about 2875.1765163203. The cubic root of 8266640 is about 202.1977607752.

The spelling of 8266640 in words is "eight million, two hundred sixty-six thousand, six hundred forty".