28642566 has 16 divisors (see below), whose sum is σ = 57544704. Its totient is φ = 9504264.

The previous prime is 28642547. The next prime is 28642571. The reversal of 28642566 is 66524682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9366 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (3596544).

Almost surely, 2^28642566 is an apocalyptic number.

28642566 is an abundant number, since it is smaller than the sum of its proper divisors (28902138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28642566 is a wasteful number, since it uses less digits than its factorization.

28642566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21635.

The product of its digits is 138240, while the sum is 39.

The square root of 28642566 is about 5351.8749985402. The cubic root of 28642566 is about 305.9642189783.

The spelling of 28642566 in words is "twenty-eight million, six hundred forty-two thousand, five hundred sixty-six".