28601136225 has 18 divisors (see below), whose sum is σ = 51227813286. Its totient is φ = 15253939200.

The previous prime is 28601136217. The next prime is 28601136227. The reversal of 28601136225 is 52263110682.

28601136225 is a `hidden beast` number, since 28 + 6 + 0 + 1 + 1 + 3 + 622 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 622552401 + 27978583824 = 24951^2 + 167268^2 .

It is not a de Polignac number, because 28601136225 - 2³ = 28601136217 is a prime.

It is a super-2 number, since 2×28601136225² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28601136225.

It is not an unprimeable number, because it can be changed into a prime (28601136227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63557856 + ... + 63558305.

It is an arithmetic number, because the mean of its divisors is an integer number (2845989627).

Almost surely, 2^28601136225 is an apocalyptic number.

28601136225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28601136225 is a deficient number, since it is larger than the sum of its proper divisors (22626677061).

28601136225 is a wasteful number, since it uses less digits than its factorization.

28601136225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127116177 (or 127116169 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 28601136225 in words is "twenty-eight billion, six hundred one million, one hundred thirty-six thousand, two hundred twenty-five".