8161664 has 32 divisors (see below), whose sum is σ = 18584400. Its totient is φ = 3497472.

The previous prime is 8161661. The next prime is 8161667. The reversal of 8161664 is 4661618.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8161661) and next prime (8161667).

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×8161664² = 133225518497792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 8161664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161661) 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, 3659 + ... + 5450.

Almost surely, 2^8161664 is an apocalyptic number.

It is an amenable number.

8161664 is an abundant number, since it is smaller than the sum of its proper divisors (10422736).

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

8161664 is an equidigital number, since it uses as much as digits as its factorization.

8161664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9130 (or 9118 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 8161664 is about 2856.8626148277. The cubic root of 8161664 is about 201.3382257874.

The spelling of 8161664 in words is "eight million, one hundred sixty-one thousand, six hundred sixty-four".