28782011 has 8 divisors (see below), whose sum is σ = 29213184. Its totient is φ = 28353960.

The previous prime is 28781971. The next prime is 28782031. The reversal of 28782011 is 11028782.

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

It is a cyclic number.

It is not a de Polignac number, because 28782011 - 2¹⁸ = 28519867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28782031) by changing a digit.

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, 22766 + ... + 23996.

It is an arithmetic number, because the mean of its divisors is an integer number (3651648).

Almost surely, 2^28782011 is an apocalyptic number.

28782011 is a deficient number, since it is larger than the sum of its proper divisors (431173).

28782011 is a wasteful number, since it uses less digits than its factorization.

28782011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28782011 is about 5364.8868580800. The cubic root of 28782011 is about 306.4599395707.

The spelling of 28782011 in words is "twenty-eight million, seven hundred eighty-two thousand, eleven".