28256134922500 has 135 divisors (see below), whose sum is σ = 63358794338763. Its totient is φ = 11022531840000.

The previous prime is 28256134922489. The next prime is 28256134922503. The reversal of 28256134922500 is 522943165282.

The square root of 28256134922500 is 5315650.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 22 ways, for example, as 15317783474436 + 12938351448064 = 3913794^2 + 3596992^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28256134922503) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 10897081204 + ... + 10897083796.

Almost surely, 2^{28256134922500} is an apocalyptic number.

28256134922500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

28256134922500 is the 5315650-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28256134922500

28256134922500 is an abundant number, since it is smaller than the sum of its proper divisors (35102659416263).

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

28256134922500 is an frugal number, since it uses more digits than its factorization.

28256134922500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292 (or 2641 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 28256134922500 in words is "twenty-eight trillion, two hundred fifty-six billion, one hundred thirty-four million, nine hundred twenty-two thousand, five hundred".