28061806 has 8 divisors (see below), whose sum is σ = 42160104. Its totient is φ = 14008440.

The previous prime is 28061767. The next prime is 28061807. The reversal of 28061806 is 60816082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061807) 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, 9625 + ... + 12196.

It is an arithmetic number, because the mean of its divisors is an integer number (5270013).

Almost surely, 2^28061806 is an apocalyptic number.

28061806 is a deficient number, since it is larger than the sum of its proper divisors (14098298).

28061806 is a wasteful number, since it uses less digits than its factorization.

28061806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22466.

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

The square root of 28061806 is about 5297.3395209294. The cubic root of 28061806 is about 303.8821608724.

Adding to 28061806 its reverse (60816082), we get a palindrome (88877888).

The spelling of 28061806 in words is "twenty-eight million, sixty-one thousand, eight hundred six".