28978159 has 6 divisors (see below), whose sum is σ = 33709344. Its totient is φ = 24838380.

The previous prime is 28978151. The next prime is 28978171. The reversal of 28978159 is 95187982.

It is not a de Polignac number, because 28978159 - 2³ = 28978151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 591391 = 28978159 / (2 + 8 + 9 + 7 + 8 + 1 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 295647 + ... + 295744.

It is an arithmetic number, because the mean of its divisors is an integer number (5618224).

Almost surely, 2^28978159 is an apocalyptic number.

28978159 is a deficient number, since it is larger than the sum of its proper divisors (4731185).

28978159 is an equidigital number, since it uses as much as digits as its factorization.

28978159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591405 (or 591398 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 28978159 is about 5383.1365392306. The cubic root of 28978159 is about 307.1545339196.

The spelling of 28978159 in words is "twenty-eight million, nine hundred seventy-eight thousand, one hundred fifty-nine".