28705747 has 16 divisors (see below), whose sum is σ = 33981120. Its totient is φ = 23735808.

The previous prime is 28705727. The next prime is 28705759. The reversal of 28705747 is 74750782.

It is a cyclic number.

It is not a de Polignac number, because 28705747 - 2⁷ = 28705619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28705727) 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 15 ways as a sum of consecutive naturals, for example, 35079 + ... + 35887.

It is an arithmetic number, because the mean of its divisors is an integer number (2123820).

Almost surely, 2^28705747 is an apocalyptic number.

28705747 is a deficient number, since it is larger than the sum of its proper divisors (5275373).

28705747 is a wasteful number, since it uses less digits than its factorization.

28705747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 28705747 is about 5357.7744446738. The cubic root of 28705747 is about 306.1890234284.

The spelling of 28705747 in words is "twenty-eight million, seven hundred five thousand, seven hundred forty-seven".