28978342 has 4 divisors (see below), whose sum is σ = 43467516. Its totient is φ = 14489170.

The previous prime is 28978307. The next prime is 28978343. The reversal of 28978342 is 24387982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978343) 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 as a sum of consecutive naturals, namely, 7244584 + ... + 7244587.

It is an arithmetic number, because the mean of its divisors is an integer number (10866879).

Almost surely, 2^28978342 is an apocalyptic number.

28978342 is a deficient number, since it is larger than the sum of its proper divisors (14489174).

28978342 is a wasteful number, since it uses less digits than its factorization.

28978342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14489173.

The product of its digits is 193536, while the sum is 43.

The square root of 28978342 is about 5383.1535367292. The cubic root of 28978342 is about 307.1551804888.

The spelling of 28978342 in words is "twenty-eight million, nine hundred seventy-eight thousand, three hundred forty-two".