28234917225 has 168 divisors, whose sum is σ = 56126511840. Its totient is φ = 14041589760.

The previous prime is 28234917223. The next prime is 28234917233. The reversal of 28234917225 is 52271943282.

28234917225 is a `hidden beast` number, since 2 + 82 + 349 + 1 + 7 + 225 = 666.

It is not a de Polignac number, because 28234917225 - 2¹ = 28234917223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28234917223) by changing a digit.

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 167 ways as a sum of consecutive naturals, for example, 23199817 + ... + 23201033.

It is an arithmetic number, because the mean of its divisors is an integer number (334086380).

Almost surely, 2^28234917225 is an apocalyptic number.

28234917225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28234917225 is a deficient number, since it is larger than the sum of its proper divisors (27891594615).

28234917225 is a wasteful number, since it uses less digits than its factorization.

28234917225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1311 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 28234917225 in words is "twenty-eight billion, two hundred thirty-four million, nine hundred seventeen thousand, two hundred twenty-five".