27809428 has 6 divisors (see below), whose sum is σ = 48666506. Its totient is φ = 13904712.

The previous prime is 27809401. The next prime is 27809443. The reversal of 27809428 is 82490872.

It can be written as a sum of positive squares in only one way, i.e., 25583364 + 2226064 = 5058^2 + 1492^2 .

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 as a sum of consecutive naturals, namely, 3476175 + ... + 3476182.

Almost surely, 2^27809428 is an apocalyptic number.

It is an amenable number.

27809428 is a deficient number, since it is larger than the sum of its proper divisors (20857078).

27809428 is a wasteful number, since it uses less digits than its factorization.

27809428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6952361 (or 6952359 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 27809428 is about 5273.4645158567. The cubic root of 27809428 is about 302.9684130208.

The spelling of 27809428 in words is "twenty-seven million, eight hundred nine thousand, four hundred twenty-eight".