28244987 has 2 divisors, whose sum is σ = 28244988. Its totient is φ = 28244986.

The previous prime is 28244977. The next prime is 28245031. The reversal of 28244987 is 78944282.

It is an a-pointer prime, because the next prime (28245031) can be obtained adding 28244987 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28244987 is a prime.

It is not a weakly prime, because it can be changed into another prime (28244917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14122493 + 14122494.

It is an arithmetic number, because the mean of its divisors is an integer number (14122494).

Almost surely, 2^28244987 is an apocalyptic number.

28244987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28244987 is an equidigital number, since it uses as much as digits as its factorization.

28244987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 44.

The square root of 28244987 is about 5314.6013020734. The cubic root of 28244987 is about 304.5419515235.

The spelling of 28244987 in words is "twenty-eight million, two hundred forty-four thousand, nine hundred eighty-seven".