28008735225 has 12 divisors (see below), whose sum is σ = 46307775696. Its totient is φ = 14937992080.

The previous prime is 28008735217. The next prime is 28008735233. The reversal of 28008735225 is 52253780082.

It is an interprime number because it is at equal distance from previous prime (28008735217) and next prime (28008735233).

It is not a de Polignac number, because 28008735225 - 2³ = 28008735217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186724827 + ... + 186724976.

It is an arithmetic number, because the mean of its divisors is an integer number (3858981308).

Almost surely, 2^28008735225 is an apocalyptic number.

28008735225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28008735225 is a deficient number, since it is larger than the sum of its proper divisors (18299040471).

28008735225 is a wasteful number, since it uses less digits than its factorization.

28008735225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373449816 (or 373449811 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 28008735225 in words is "twenty-eight billion, eight million, seven hundred thirty-five thousand, two hundred twenty-five".