28891646 has 16 divisors (see below), whose sum is σ = 49597920. Its totient is φ = 12364800.

The previous prime is 28891633. The next prime is 28891669. The reversal of 28891646 is 64619882.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28891597 and 28891606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17246 + ... + 18846.

It is an arithmetic number, because the mean of its divisors is an integer number (3099870).

Almost surely, 2^28891646 is an apocalyptic number.

28891646 is a deficient number, since it is larger than the sum of its proper divisors (20706274).

28891646 is a wasteful number, since it uses less digits than its factorization.

28891646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899.

The product of its digits is 165888, while the sum is 44.

The square root of 28891646 is about 5375.0949759051. The cubic root of 28891646 is about 306.8485638478.

The spelling of 28891646 in words is "twenty-eight million, eight hundred ninety-one thousand, six hundred forty-six".