28871785 has 8 divisors (see below), whose sum is σ = 36152640. Its totient is φ = 22093104.

The previous prime is 28871779. The next prime is 28871789. The reversal of 28871785 is 58717882.

It is a happy number.

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 28871785 - 2⁵ = 28871753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28871789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125415 + ... + 125644.

It is an arithmetic number, because the mean of its divisors is an integer number (4519080).

Almost surely, 2^28871785 is an apocalyptic number.

It is an amenable number.

28871785 is a deficient number, since it is larger than the sum of its proper divisors (7280855).

28871785 is a wasteful number, since it uses less digits than its factorization.

28871785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251087.

The product of its digits is 250880, while the sum is 46.

The square root of 28871785 is about 5373.2471560501. The cubic root of 28871785 is about 306.7782353713.

The spelling of 28871785 in words is "twenty-eight million, eight hundred seventy-one thousand, seven hundred eighty-five".