8181328 has 10 divisors (see below), whose sum is σ = 15851354. Its totient is φ = 4090656.

The previous prime is 8181317. The next prime is 8181347. The reversal of 8181328 is 8231818.

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 2286144 = 2428^2 + 1512^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8181328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255651 + ... + 255682.

Almost surely, 2^8181328 is an apocalyptic number.

It is an amenable number.

8181328 is a deficient number, since it is larger than the sum of its proper divisors (7670026).

8181328 is a wasteful number, since it uses less digits than its factorization.

8181328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511341 (or 511335 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 8181328 is about 2860.3020819487. The cubic root of 8181328 is about 201.4997916780.

The spelling of 8181328 in words is "eight million, one hundred eighty-one thousand, three hundred twenty-eight".