28187284 has 12 divisors (see below), whose sum is σ = 50023008. Its totient is φ = 13895000.

The previous prime is 28187273. The next prime is 28187287. The reversal of 28187284 is 48278182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187287) 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, 49342 + ... + 49909.

It is an arithmetic number, because the mean of its divisors is an integer number (4168584).

Almost surely, 2^28187284 is an apocalyptic number.

It is an amenable number.

28187284 is a deficient number, since it is larger than the sum of its proper divisors (21835724).

28187284 is a wasteful number, since it uses less digits than its factorization.

28187284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99326 (or 99324 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 28187284 is about 5309.1698032743. The cubic root of 28187284 is about 304.3344224881.

The spelling of 28187284 in words is "twenty-eight million, one hundred eighty-seven thousand, two hundred eighty-four".