28327919481 has 15 divisors (see below), whose sum is σ = 42319278463. Its totient is φ = 18884269800.

The previous prime is 28327919441. The next prime is 28327919483. The reversal of 28327919481 is 18491972382.

The square root of 28327919481 is 168309.

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

28327919481 is a `hidden beast` number, since 2 + 83 + 2 + 79 + 19 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4863807081 + 23464112400 = 69741^2 + 153180^2 .

It is not a de Polignac number, because 28327919481 - 2⁷ = 28327919353 is a prime.

It is a super-2 number, since 2×28327919481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28327919483) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1505431 + ... + 1524131.

Almost surely, 2^28327919481 is an apocalyptic number.

28327919481 is the 168309-th square number.

28327919481 is the 84155-th centered octagonal number.

It is an amenable number.

28327919481 is a deficient number, since it is larger than the sum of its proper divisors (13991358982).

28327919481 is an frugal number, since it uses more digits than its factorization.

28327919481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37414 (or 18704 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 28327919481 in words is "twenty-eight billion, three hundred twenty-seven million, nine hundred nineteen thousand, four hundred eighty-one".