28009546 has 16 divisors (see below), whose sum is σ = 43302600. Its totient is φ = 13581568.

The previous prime is 28009543. The next prime is 28009549. The reversal of 28009546 is 64590082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28009543) and next prime (28009549).

It can be written as a sum of positive squares in 4 ways, for example, as 13653025 + 14356521 = 3695^2 + 3789^2 .

It is a super-2 number, since 2×28009546² = 1569069334252232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28009543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7950 + ... + 10918.

Almost surely, 2^28009546 is an apocalyptic number.

28009546 is a deficient number, since it is larger than the sum of its proper divisors (15293054).

28009546 is a wasteful number, since it uses less digits than its factorization.

28009546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 28009546 is about 5292.4045574767. The cubic root of 28009546 is about 303.6934019313.

The spelling of 28009546 in words is "twenty-eight million, nine thousand, five hundred forty-six".