28181752450 has 12 divisors (see below), whose sum is σ = 52418059650. Its totient is φ = 11272700960.

The previous prime is 28181752433. The next prime is 28181752453. The reversal of 28181752450 is 5425718182.

It can be written as a sum of positive squares in 3 ways, for example, as 26029627569 + 2152124881 = 161337^2 + 46391^2 .

It is a super-2 number, since 2×28181752450² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28181752397 and 28181752406.

It is not an unprimeable number, because it can be changed into a prime (28181752453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281817475 + ... + 281817574.

Almost surely, 2^28181752450 is an apocalyptic number.

28181752450 is a deficient number, since it is larger than the sum of its proper divisors (24236307200).

28181752450 is a wasteful number, since it uses less digits than its factorization.

28181752450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563635061 (or 563635056 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 43.

The spelling of 28181752450 in words is "twenty-eight billion, one hundred eighty-one million, seven hundred fifty-two thousand, four hundred fifty".