28447278 has 16 divisors (see below), whose sum is σ = 56948736. Its totient is φ = 9473400.

The previous prime is 28447259. The next prime is 28447283. The reversal of 28447278 is 87274482.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8553 + ... + 11403.

It is an arithmetic number, because the mean of its divisors is an integer number (3559296).

Almost surely, 2^28447278 is an apocalyptic number.

28447278 is an abundant number, since it is smaller than the sum of its proper divisors (28501458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28447278 is a wasteful number, since it uses less digits than its factorization.

28447278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519.

The product of its digits is 200704, while the sum is 42.

The square root of 28447278 is about 5333.5989725513. The cubic root of 28447278 is about 305.2672672966.

The spelling of 28447278 in words is "twenty-eight million, four hundred forty-seven thousand, two hundred seventy-eight".