28025278 has 8 divisors (see below), whose sum is σ = 42454440. Its totient is φ = 13873800.

The previous prime is 28025273. The next prime is 28025297. The reversal of 28025278 is 87252082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69168 + ... + 69571.

It is an arithmetic number, because the mean of its divisors is an integer number (5306805).

Almost surely, 2^28025278 is an apocalyptic number.

28025278 is a deficient number, since it is larger than the sum of its proper divisors (14429162).

28025278 is a wasteful number, since it uses less digits than its factorization.

28025278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138842.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28025278 is about 5293.8906297732. The cubic root of 28025278 is about 303.7502493407.

The spelling of 28025278 in words is "twenty-eight million, twenty-five thousand, two hundred seventy-eight".