8685215438 has 16 divisors (see below), whose sum is σ = 13906650240. Its totient is φ = 4056103800.

The previous prime is 8685215401. The next prime is 8685215453. The reversal of 8685215438 is 8345125868.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606868 + ... + 1612263.

It is an arithmetic number, because the mean of its divisors is an integer number (869165640).

Almost surely, 2^8685215438 is an apocalyptic number.

8685215438 is a deficient number, since it is larger than the sum of its proper divisors (5221434802).

8685215438 is a wasteful number, since it uses less digits than its factorization.

8685215438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219223.

The product of its digits is 1843200, while the sum is 50.

The square root of 8685215438 is about 93194.5032606537. The cubic root of 8685215438 is about 2055.5444150901.

The spelling of 8685215438 in words is "eight billion, six hundred eighty-five million, two hundred fifteen thousand, four hundred thirty-eight".