28919566 has 8 divisors (see below), whose sum is σ = 46716264. Its totient is φ = 13347480.

The previous prime is 28919563. The next prime is 28919581. The reversal of 28919566 is 66591982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 556120 + ... + 556171.

It is an arithmetic number, because the mean of its divisors is an integer number (5839533).

Almost surely, 2^28919566 is an apocalyptic number.

28919566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28919566 is a deficient number, since it is larger than the sum of its proper divisors (17796698).

28919566 is a wasteful number, since it uses less digits than its factorization.

28919566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112306.

The product of its digits is 233280, while the sum is 46.

The square root of 28919566 is about 5377.6915121639. The cubic root of 28919566 is about 306.9473750368.

The spelling of 28919566 in words is "twenty-eight million, nine hundred nineteen thousand, five hundred sixty-six".