8181656 has 32 divisors (see below), whose sum is σ = 17646240. Its totient is φ = 3483648.

The previous prime is 8181637. The next prime is 8181697. The reversal of 8181656 is 6561818.

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

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10430 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (551445).

Almost surely, 2^8181656 is an apocalyptic number.

It is an amenable number.

8181656 is an abundant number, since it is smaller than the sum of its proper divisors (9464584).

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

8181656 is a wasteful number, since it uses less digits than its factorization.

8181656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 959 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 8181656 is about 2860.3594179753. The cubic root of 8181656 is about 201.5024844376.

The spelling of 8181656 in words is "eight million, one hundred eighty-one thousand, six hundred fifty-six".