8161216 has 28 divisors (see below), whose sum is σ = 18509488. Its totient is φ = 3497472.

The previous prime is 8161213. The next prime is 8161243. The reversal of 8161216 is 6121618.

It is a tau number, because it is divible by the number of its divisors (28).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161213) by changing a digit.

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, 8661 + ... + 9556.

Almost surely, 2^8161216 is an apocalyptic number.

It is an amenable number.

8161216 is an abundant number, since it is smaller than the sum of its proper divisors (10348272).

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

8161216 is a wasteful number, since it uses less digits than its factorization.

8161216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18236 (or 18226 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 8161216 is about 2856.7842060611. The cubic root of 8161216 is about 201.3345418501.

The spelling of 8161216 in words is "eight million, one hundred sixty-one thousand, two hundred sixteen".