8408640815 has 4 divisors (see below), whose sum is σ = 10090368984. Its totient is φ = 6726912648.

The previous prime is 8408640809. The next prime is 8408640871. The reversal of 8408640815 is 5180468048.

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

It is a cyclic number.

It is not a de Polignac number, because 8408640815 - 2²⁰ = 8407592239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840864077 + ... + 840864086.

It is an arithmetic number, because the mean of its divisors is an integer number (2522592246).

Almost surely, 2^8408640815 is an apocalyptic number.

8408640815 is a deficient number, since it is larger than the sum of its proper divisors (1681728169).

8408640815 is a wasteful number, since it uses less digits than its factorization.

8408640815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681728168.

The product of its (nonzero) digits is 245760, while the sum is 44.

The square root of 8408640815 is about 91698.6412930966. The cubic root of 8408640815 is about 2033.4894980092.

The spelling of 8408640815 in words is "eight billion, four hundred eight million, six hundred forty thousand, eight hundred fifteen".