28640606 has 16 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 14007000.

The previous prime is 28640587. The next prime is 28640609. The reversal of 28640606 is 60604682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29135 + ... + 30101.

It is an arithmetic number, because the mean of its divisors is an integer number (2744280).

Almost surely, 2^28640606 is an apocalyptic number.

28640606 is a deficient number, since it is larger than the sum of its proper divisors (15267874).

28640606 is a wasteful number, since it uses less digits than its factorization.

28640606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28640606 is about 5351.6918820126. The cubic root of 28640606 is about 305.9572398137.

The spelling of 28640606 in words is "twenty-eight million, six hundred forty thousand, six hundred six".