8161810 has 16 divisors (see below), whose sum is σ = 14838552. Its totient is φ = 3232000.

The previous prime is 8161807. The next prime is 8161817. The reversal of 8161810 is 181618.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7656289 + 505521 = 2767^2 + 711^2 .

It is a super-4 number, since 4×8161810⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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

It is not an unprimeable number, because it can be changed into a prime (8161817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3031 + ... + 5050.

Almost surely, 2^8161810 is an apocalyptic number.

8161810 is a deficient number, since it is larger than the sum of its proper divisors (6676742).

8161810 is a wasteful number, since it uses less digits than its factorization.

8161810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8189.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 8161810 is about 2856.8881672197. Note that the first 3 decimals coincide. The cubic root of 8161810 is about 201.3394263271.

The spelling of 8161810 in words is "eight million, one hundred sixty-one thousand, eight hundred ten".