28928241225 has 54 divisors (see below), whose sum is σ = 56106026730. Its totient is φ = 14241576960.

The previous prime is 28928241203. The next prime is 28928241259. The reversal of 28928241225 is 52214282982.

It can be written as a sum of positive squares in 9 ways, for example, as 10910011401 + 18018229824 = 104451^2 + 134232^2 .

It is not a de Polignac number, because 28928241225 - 2¹⁸ = 28927979081 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 342360 + ... + 418409.

It is an arithmetic number, because the mean of its divisors is an integer number (1039000495).

Almost surely, 2^28928241225 is an apocalyptic number.

28928241225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28928241225 is a deficient number, since it is larger than the sum of its proper divisors (27177785505).

28928241225 is a wasteful number, since it uses less digits than its factorization.

28928241225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760811 (or 760790 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The spelling of 28928241225 in words is "twenty-eight billion, nine hundred twenty-eight million, two hundred forty-one thousand, two hundred twenty-five".