28220328825 has 96 divisors (see below), whose sum is σ = 51275218176. Its totient is φ = 13611663360.

The previous prime is 28220328781. The next prime is 28220328853. The reversal of 28220328825 is 52882302282.

It is not a de Polignac number, because 28220328825 - 2¹² = 28220324729 is a prime.

It is a super-2 number, since 2×28220328825² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9739777 + ... + 9742673.

It is an arithmetic number, because the mean of its divisors is an integer number (534116856).

Almost surely, 2^28220328825 is an apocalyptic number.

28220328825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28220328825 is a deficient number, since it is larger than the sum of its proper divisors (23054889351).

28220328825 is a wasteful number, since it uses less digits than its factorization.

28220328825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 42.

The spelling of 28220328825 in words is "twenty-eight billion, two hundred twenty million, three hundred twenty-eight thousand, eight hundred twenty-five".