28009574 has 16 divisors (see below), whose sum is σ = 44761248. Its totient is φ = 13099392.

The previous prime is 28009559. The next prime is 28009609. The reversal of 28009574 is 47590082.

It is a happy number.

It is a super-2 number, since 2×28009574² = 1569072471322952, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3212 + ... + 8144.

It is an arithmetic number, because the mean of its divisors is an integer number (2797578).

Almost surely, 2^28009574 is an apocalyptic number.

28009574 is a deficient number, since it is larger than the sum of its proper divisors (16751674).

28009574 is a wasteful number, since it uses less digits than its factorization.

28009574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28009574 is about 5292.4072027764. The cubic root of 28009574 is about 303.6935031279.

The spelling of 28009574 in words is "twenty-eight million, nine thousand, five hundred seventy-four".