8161640 has 32 divisors (see below), whose sum is σ = 19332000. Its totient is φ = 3092544.

The previous prime is 8161631. The next prime is 8161661. The reversal of 8161640 is 461618.

It is a super-2 number, since 2×8161640² = 133224734979200, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4610 + ... + 6129.

It is an arithmetic number, because the mean of its divisors is an integer number (604125).

Almost surely, 2^8161640 is an apocalyptic number.

It is an amenable number.

8161640 is an abundant number, since it is smaller than the sum of its proper divisors (11170360).

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

8161640 is a wasteful number, since it uses less digits than its factorization.

8161640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10769 (or 10765 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8161640 is about 2856.8584144126. The cubic root of 8161640 is about 201.3380284370.

The spelling of 8161640 in words is "eight million, one hundred sixty-one thousand, six hundred forty".