28078238 has 16 divisors (see below), whose sum is σ = 44442240. Its totient is φ = 13267800.

The previous prime is 28078229. The next prime is 28078243. The reversal of 28078238 is 83287082.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

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, 23393 + ... + 24563.

It is an arithmetic number, because the mean of its divisors is an integer number (2777640).

Almost surely, 2^28078238 is an apocalyptic number.

28078238 is a deficient number, since it is larger than the sum of its proper divisors (16364002).

28078238 is a wasteful number, since it uses less digits than its factorization.

28078238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28078238 is about 5298.8902611773. The cubic root of 28078238 is about 303.9414635100.

The spelling of 28078238 in words is "twenty-eight million, seventy-eight thousand, two hundred thirty-eight".