28978738 has 8 divisors (see below), whose sum is σ = 44870400. Its totient is φ = 14021940.

The previous prime is 28978723. The next prime is 28978739. The reversal of 28978738 is 83787982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28978739) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 233638 + ... + 233761.

It is an arithmetic number, because the mean of its divisors is an integer number (5608800).

Almost surely, 2^28978738 is an apocalyptic number.

28978738 is a deficient number, since it is larger than the sum of its proper divisors (15891662).

28978738 is a wasteful number, since it uses less digits than its factorization.

28978738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467432.

The product of its digits is 1354752, while the sum is 52.

The square root of 28978738 is about 5383.1903180177. The cubic root of 28978738 is about 307.1565796130.

The spelling of 28978738 in words is "twenty-eight million, nine hundred seventy-eight thousand, seven hundred thirty-eight".