28061811 has 24 divisors (see below), whose sum is σ = 41530320. Its totient is φ = 18254016.

The previous prime is 28061807. The next prime is 28061819. The reversal of 28061811 is 11816082.

It is not a de Polignac number, because 28061811 - 2² = 28061807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104185 + ... + 104453.

It is an arithmetic number, because the mean of its divisors is an integer number (1730430).

Almost surely, 2^28061811 is an apocalyptic number.

28061811 is a deficient number, since it is larger than the sum of its proper divisors (13468509).

28061811 is a wasteful number, since it uses less digits than its factorization.

28061811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 512 counting only the distinct ones).

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

The square root of 28061811 is about 5297.3399928643. The cubic root of 28061811 is about 303.8821789208.

Adding to 28061811 its reverse (11816082), we get a palindrome (39877893).

The spelling of 28061811 in words is "twenty-eight million, sixty-one thousand, eight hundred eleven".