8215864 has 16 divisors (see below), whose sum is σ = 15472800. Its totient is φ = 4089792.

The previous prime is 8215861. The next prime is 8215877. The reversal of 8215864 is 4685128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8215861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237 + ... + 4060.

It is an arithmetic number, because the mean of its divisors is an integer number (967050).

Almost surely, 2^8215864 is an apocalyptic number.

It is an amenable number.

8215864 is a deficient number, since it is larger than the sum of its proper divisors (7256936).

8215864 is a wasteful number, since it uses less digits than its factorization.

8215864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542 (or 4538 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 8215864 is about 2866.3328487808. The cubic root of 8215864 is about 201.7829253231.

The spelling of 8215864 in words is "eight million, two hundred fifteen thousand, eight hundred sixty-four".