28872278 has 4 divisors (see below), whose sum is σ = 43308420. Its totient is φ = 14436138.

The previous prime is 28872271. The next prime is 28872281. The reversal of 28872278 is 87227882.

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 (28872271) 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, 7218068 + ... + 7218071.

It is an arithmetic number, because the mean of its divisors is an integer number (10827105).

Almost surely, 2^28872278 is an apocalyptic number.

28872278 is a deficient number, since it is larger than the sum of its proper divisors (14436142).

28872278 is a wasteful number, since it uses less digits than its factorization.

28872278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436141.

The product of its digits is 200704, while the sum is 44.

The square root of 28872278 is about 5373.2930312798. The cubic root of 28872278 is about 306.7799814914.

The spelling of 28872278 in words is "twenty-eight million, eight hundred seventy-two thousand, two hundred seventy-eight".