8181728 has 12 divisors (see below), whose sum is σ = 16107840. Its totient is φ = 4090848.

The previous prime is 8181727. The next prime is 8181731. The reversal of 8181728 is 8271818.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127808 + ... + 127871.

It is an arithmetic number, because the mean of its divisors is an integer number (1342320).

Almost surely, 2^8181728 is an apocalyptic number.

It is an amenable number.

8181728 is a deficient number, since it is larger than the sum of its proper divisors (7926112).

8181728 is a wasteful number, since it uses less digits than its factorization.

8181728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255689 (or 255681 counting only the distinct ones).

The product of its digits is 7168, while the sum is 35.

The square root of 8181728 is about 2860.3720037785. The cubic root of 8181728 is about 201.5030755215.

The spelling of 8181728 in words is "eight million, one hundred eighty-one thousand, seven hundred twenty-eight".