28182217451 has 4 divisors (see below), whose sum is σ = 28371360000. Its totient is φ = 27993074904.

The previous prime is 28182217447. The next prime is 28182217493. The reversal of 28182217451 is 15471228182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28182217451 - 2² = 28182217447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28182217399 and 28182217408.

It is not an unprimeable number, because it can be changed into a prime (28182217421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94571051 + ... + 94571348.

It is an arithmetic number, because the mean of its divisors is an integer number (7092840000).

Almost surely, 2^28182217451 is an apocalyptic number.

28182217451 is a deficient number, since it is larger than the sum of its proper divisors (189142549).

28182217451 is a wasteful number, since it uses less digits than its factorization.

28182217451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189142548.

The product of its digits is 71680, while the sum is 41.

The spelling of 28182217451 in words is "twenty-eight billion, one hundred eighty-two million, two hundred seventeen thousand, four hundred fifty-one".