28071806 has 32 divisors (see below), whose sum is σ = 49612800. Its totient is φ = 11907000.

The previous prime is 28071761. The next prime is 28071809. The reversal of 28071806 is 60817082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103451 + ... + 103721.

It is an arithmetic number, because the mean of its divisors is an integer number (1550400).

Almost surely, 2^28071806 is an apocalyptic number.

28071806 is a deficient number, since it is larger than the sum of its proper divisors (21540994).

28071806 is a wasteful number, since it uses less digits than its factorization.

28071806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28071806 is about 5298.2833068835. The cubic root of 28071806 is about 303.9182533547.

Adding to 28071806 its reverse (60817082), we get a palindrome (88888888).

The spelling of 28071806 in words is "twenty-eight million, seventy-one thousand, eight hundred six".