28172258450 has 54 divisors (see below), whose sum is σ = 60973549173. Its totient is φ = 9656211600.

The previous prime is 28172258447. The next prime is 28172258459. The reversal of 28172258450 is 5485227182.

It can be written as a sum of positive squares in 2 ways, for example, as 27608813281 + 563445169 = 166159^2 + 23737^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118685.

It is a super-2 number, since 2×28172258450² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28172258459) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8306255 + ... + 8309645.

Almost surely, 2^28172258450 is an apocalyptic number.

28172258450 is an abundant number, since it is smaller than the sum of its proper divisors (32801290723).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28172258450 is an frugal number, since it uses more digits than its factorization.

28172258450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808 (or 3405 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 44.

The spelling of 28172258450 in words is "twenty-eight billion, one hundred seventy-two million, two hundred fifty-eight thousand, four hundred fifty".