28278424 has 8 divisors (see below), whose sum is σ = 53022060. Its totient is φ = 14139208.

The previous prime is 28278421. The next prime is 28278449. The reversal of 28278424 is 42487282.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1767394 + ... + 1767409.

Almost surely, 2^28278424 is an apocalyptic number.

It is an amenable number.

28278424 is a deficient number, since it is larger than the sum of its proper divisors (24743636).

28278424 is a wasteful number, since it uses less digits than its factorization.

28278424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534809 (or 3534805 counting only the distinct ones).

The product of its digits is 57344, while the sum is 37.

The square root of 28278424 is about 5317.7461391082. The cubic root of 28278424 is about 304.6620784874.

The spelling of 28278424 in words is "twenty-eight million, two hundred seventy-eight thousand, four hundred twenty-four".