28181061 has 8 divisors (see below), whose sum is σ = 41749760. Its totient is φ = 18787356.

The previous prime is 28181051. The next prime is 28181089. The reversal of 28181061 is 16018182.

It is not a de Polignac number, because 28181061 - 2⁹ = 28180549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1043743 = 28181061 / (2 + 8 + 1 + 8 + 1 + 0 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28181051) 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, 521845 + ... + 521898.

It is an arithmetic number, because the mean of its divisors is an integer number (5218720).

Almost surely, 2^28181061 is an apocalyptic number.

It is an amenable number.

28181061 is a deficient number, since it is larger than the sum of its proper divisors (13568699).

28181061 is a wasteful number, since it uses less digits than its factorization.

28181061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043752 (or 1043746 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 28181061 is about 5308.5837094276. The cubic root of 28181061 is about 304.3120245337.

The spelling of 28181061 in words is "twenty-eight million, one hundred eighty-one thousand, sixty-one".