27978428 has 6 divisors (see below), whose sum is σ = 48962256. Its totient is φ = 13989212.

The previous prime is 27978383. The next prime is 27978487. The reversal of 27978428 is 82487972.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497300 + ... + 3497307.

It is an arithmetic number, because the mean of its divisors is an integer number (8160376).

Almost surely, 2^27978428 is an apocalyptic number.

It is an amenable number.

27978428 is a deficient number, since it is larger than the sum of its proper divisors (20983828).

27978428 is a wasteful number, since it uses less digits than its factorization.

27978428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994611 (or 6994609 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 27978428 is about 5289.4638669718. The cubic root of 27978428 is about 303.5808946556.

The spelling of 27978428 in words is "twenty-seven million, nine hundred seventy-eight thousand, four hundred twenty-eight".