28581082 has 4 divisors (see below), whose sum is σ = 42871626. Its totient is φ = 14290540.

The previous prime is 28581071. The next prime is 28581083. The reversal of 28581082 is 28018582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 10949481 = 4199^2 + 3309^2 .

It is not an unprimeable number, because it can be changed into a prime (28581083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7145269 + ... + 7145272.

Almost surely, 2^28581082 is an apocalyptic number.

28581082 is a deficient number, since it is larger than the sum of its proper divisors (14290544).

28581082 is a wasteful number, since it uses less digits than its factorization.

28581082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14290543.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 28581082 is about 5346.1277575456. The cubic root of 28581082 is about 305.7451350150.

Subtracting from 28581082 its reverse (28018582), we obtain a square (562500 = 750²).

The spelling of 28581082 in words is "twenty-eight million, five hundred eighty-one thousand, eighty-two".