7981328 has 10 divisors (see below), whose sum is σ = 15463854. Its totient is φ = 3990656.

The previous prime is 7981327. The next prime is 7981331. The reversal of 7981328 is 8231897.

It can be written as a sum of positive squares in only one way, i.e., 7907344 + 73984 = 2812^2 + 272^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7981291 and 7981300.

It is not an unprimeable number, because it can be changed into a prime (7981321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249401 + ... + 249432.

Almost surely, 2^7981328 is an apocalyptic number.

It is an amenable number.

7981328 is a deficient number, since it is larger than the sum of its proper divisors (7482526).

7981328 is a wasteful number, since it uses less digits than its factorization.

7981328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498841 (or 498835 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 7981328 is about 2825.1244220388. The cubic root of 7981328 is about 199.8442787860.

The spelling of 7981328 in words is "seven million, nine hundred eighty-one thousand, three hundred twenty-eight".