28060821 has 12 divisors (see below), whose sum is σ = 40591980. Its totient is φ = 18679680.

The previous prime is 28060817. The next prime is 28060831. The reversal of 28060821 is 12806082.

It can be written as a sum of positive squares in 2 ways, for example, as 14333796 + 13727025 = 3786^2 + 3705^2 .

It is not a de Polignac number, because 28060821 - 2² = 28060817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28060801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5581 + ... + 9341.

It is an arithmetic number, because the mean of its divisors is an integer number (3382665).

Almost surely, 2^28060821 is an apocalyptic number.

It is an amenable number.

28060821 is a deficient number, since it is larger than the sum of its proper divisors (12531159).

28060821 is a wasteful number, since it uses less digits than its factorization.

28060821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596 (or 4593 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28060821 is about 5297.2465489158. The cubic root of 28060821 is about 303.8786052990.

The spelling of 28060821 in words is "twenty-eight million, sixty thousand, eight hundred twenty-one".