28281646 has 4 divisors (see below), whose sum is σ = 42422472. Its totient is φ = 14140822.

The previous prime is 28281629. The next prime is 28281679. The reversal of 28281646 is 64618282.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7070410 + ... + 7070413.

It is an arithmetic number, because the mean of its divisors is an integer number (10605618).

Almost surely, 2^28281646 is an apocalyptic number.

28281646 is a deficient number, since it is larger than the sum of its proper divisors (14140826).

28281646 is a wasteful number, since it uses less digits than its factorization.

28281646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14140825.

The product of its digits is 36864, while the sum is 37.

The square root of 28281646 is about 5318.0490783745. The cubic root of 28281646 is about 304.6736489570.

The spelling of 28281646 in words is "twenty-eight million, two hundred eighty-one thousand, six hundred forty-six".