28205771 has 8 divisors (see below), whose sum is σ = 32580144. Its totient is φ = 24133120.

The previous prime is 28205767. The next prime is 28205783. The reversal of 28205771 is 17750282.

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

It is not a de Polignac number, because 28205771 - 2² = 28205767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28205711) 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, 75230 + ... + 75603.

It is an arithmetic number, because the mean of its divisors is an integer number (4072518).

Almost surely, 2^28205771 is an apocalyptic number.

28205771 is a deficient number, since it is larger than the sum of its proper divisors (4374373).

28205771 is a wasteful number, since it uses less digits than its factorization.

28205771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150861.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28205771 is about 5310.9105622294. The cubic root of 28205771 is about 304.4009418555.

The spelling of 28205771 in words is "twenty-eight million, two hundred five thousand, seven hundred seventy-one".