28878506 has 8 divisors (see below), whose sum is σ = 43701444. Its totient is φ = 14311360.

The previous prime is 28878497. The next prime is 28878517. The reversal of 28878506 is 60587882.

It can be written as a sum of positive squares in 2 ways, for example, as 20784481 + 8094025 = 4559^2 + 2845^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 63665 + ... + 64116.

Almost surely, 2^28878506 is an apocalyptic number.

28878506 is a deficient number, since it is larger than the sum of its proper divisors (14822938).

28878506 is a wasteful number, since it uses less digits than its factorization.

28878506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127896.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 28878506 is about 5373.8725329133. The cubic root of 28878506 is about 306.8020382704.

The spelling of 28878506 in words is "twenty-eight million, eight hundred seventy-eight thousand, five hundred six".