28671806 has 4 divisors (see below), whose sum is σ = 43007712. Its totient is φ = 14335902.

The previous prime is 28671803. The next prime is 28671821. The reversal of 28671806 is 60817682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60817682 = 2 ⋅30408841.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28671806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7167950 + ... + 7167953.

It is an arithmetic number, because the mean of its divisors is an integer number (10751928).

Almost surely, 2^28671806 is an apocalyptic number.

28671806 is a deficient number, since it is larger than the sum of its proper divisors (14335906).

28671806 is a wasteful number, since it uses less digits than its factorization.

28671806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14335905.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28671806 is about 5354.6060546038. The cubic root of 28671806 is about 306.0682989358.

The spelling of 28671806 in words is "twenty-eight million, six hundred seventy-one thousand, eight hundred six".