28347566 has 16 divisors (see below), whose sum is σ = 46478544. Its totient is φ = 12887424.

The previous prime is 28347559. The next prime is 28347611. The reversal of 28347566 is 66574382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6395 + ... + 9878.

It is an arithmetic number, because the mean of its divisors is an integer number (2904909).

Almost surely, 2^28347566 is an apocalyptic number.

28347566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28347566 is a deficient number, since it is larger than the sum of its proper divisors (18130978).

28347566 is a wasteful number, since it uses less digits than its factorization.

28347566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16355.

The product of its digits is 241920, while the sum is 41.

The square root of 28347566 is about 5324.2432326106. The cubic root of 28347566 is about 304.9101804852.

The spelling of 28347566 in words is "twenty-eight million, three hundred forty-seven thousand, five hundred sixty-six".