28878082 has 4 divisors (see below), whose sum is σ = 43317126. Its totient is φ = 14439040.

The previous prime is 28878077. The next prime is 28878127. The reversal of 28878082 is 28087882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28087882 = 2 ⋅14043941.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 159201 = 5359^2 + 399^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7219519 + ... + 7219522.

Almost surely, 2^28878082 is an apocalyptic number.

28878082 is a deficient number, since it is larger than the sum of its proper divisors (14439044).

28878082 is a wasteful number, since it uses less digits than its factorization.

28878082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14439043.

The product of its (nonzero) digits is 114688, while the sum is 43.

The square root of 28878082 is about 5373.8330826329. The cubic root of 28878082 is about 306.8005367534.

The spelling of 28878082 in words is "twenty-eight million, eight hundred seventy-eight thousand, eighty-two".