28806061 has 4 divisors (see below), whose sum is σ = 28910332. Its totient is φ = 28701792.

The previous prime is 28806059. The next prime is 28806079. The reversal of 28806061 is 16060882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16060882 = 2 ⋅8030441.

It can be written as a sum of positive squares in 2 ways, for example, as 2232036 + 26574025 = 1494^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 28806061 - 2¹ = 28806059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28806361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51720 + ... + 52273.

It is an arithmetic number, because the mean of its divisors is an integer number (7227583).

Almost surely, 2^28806061 is an apocalyptic number.

It is an amenable number.

28806061 is a deficient number, since it is larger than the sum of its proper divisors (104271).

28806061 is a wasteful number, since it uses less digits than its factorization.

28806061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104270.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28806061 is about 5367.1278166259. The cubic root of 28806061 is about 306.5452742337.

The spelling of 28806061 in words is "twenty-eight million, eight hundred six thousand, sixty-one".