28782566 has 8 divisors (see below), whose sum is σ = 44178024. Its totient is φ = 14056560.

The previous prime is 28782553. The next prime is 28782571. The reversal of 28782566 is 66528782.

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

It is a super-2 number, since 2×28782566² = 1656872211088712, which contains 22 as substring.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 167255 + ... + 167426.

It is an arithmetic number, because the mean of its divisors is an integer number (5522253).

Almost surely, 2^28782566 is an apocalyptic number.

28782566 is a deficient number, since it is larger than the sum of its proper divisors (15395458).

28782566 is a wasteful number, since it uses less digits than its factorization.

28782566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334726.

The product of its digits is 322560, while the sum is 44.

The square root of 28782566 is about 5364.9385830595. The cubic root of 28782566 is about 306.4619093679.

The spelling of 28782566 in words is "twenty-eight million, seven hundred eighty-two thousand, five hundred sixty-six".