28531466 has 12 divisors (see below), whose sum is σ = 43407702. Its totient is φ = 14065056.

The previous prime is 28531463. The next prime is 28531471. The reversal of 28531466 is 66413582.

It can be written as a sum of positive squares in 3 ways, for example, as 18105025 + 10426441 = 4255^2 + 3229^2 .

It is not an unprimeable number, because it can be changed into a prime (28531463) 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 in 5 ways as a sum of consecutive naturals, for example, 9320 + ... + 11996.

Almost surely, 2^28531466 is an apocalyptic number.

28531466 is a deficient number, since it is larger than the sum of its proper divisors (14876236).

28531466 is an equidigital number, since it uses as much as digits as its factorization.

28531466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825 (or 2752 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 28531466 is about 5341.4853739386. The cubic root of 28531466 is about 305.5681107250.

The spelling of 28531466 in words is "twenty-eight million, five hundred thirty-one thousand, four hundred sixty-six".