28081785 has 16 divisors (see below), whose sum is σ = 45779904. Its totient is φ = 14693952.

The previous prime is 28081771. The next prime is 28081787. The reversal of 28081785 is 58718082.

It is not a de Polignac number, because 28081785 - 2⁴ = 28081769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16867 + ... + 18456.

It is an arithmetic number, because the mean of its divisors is an integer number (2861244).

Almost surely, 2^28081785 is an apocalyptic number.

It is an amenable number.

28081785 is a deficient number, since it is larger than the sum of its proper divisors (17698119).

28081785 is a wasteful number, since it uses less digits than its factorization.

28081785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35384.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28081785 is about 5299.2249433290. The cubic root of 28081785 is about 303.9542614994.

The spelling of 28081785 in words is "twenty-eight million, eighty-one thousand, seven hundred eighty-five".