8640836 has 6 divisors (see below), whose sum is σ = 15121470. Its totient is φ = 4320416.

The previous prime is 8640823. The next prime is 8640859. The reversal of 8640836 is 6380468.

It can be written as a sum of positive squares in only one way, i.e., 6791236 + 1849600 = 2606^2 + 1360^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8640796 and 8640805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080101 + ... + 1080108.

It is an arithmetic number, because the mean of its divisors is an integer number (2520245).

Almost surely, 2^8640836 is an apocalyptic number.

It is an amenable number.

8640836 is a deficient number, since it is larger than the sum of its proper divisors (6480634).

8640836 is a wasteful number, since it uses less digits than its factorization.

8640836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160213 (or 2160211 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 8640836 is about 2939.5298943879. The cubic root of 8640836 is about 205.2037316280.

The spelling of 8640836 in words is "eight million, six hundred forty thousand, eight hundred thirty-six".