28399327441 has 27 divisors (see below), whose sum is σ = 31610171803. Its totient is φ = 25507338560.

The previous prime is 28399327433. The next prime is 28399327483. The reversal of 28399327441 is 14472399382.

The square root of 28399327441 is 168521.

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

It can be written as a sum of positive squares in only one way, i.e., 22110203025 + 6289124416 = 148695^2 + 79304^2 .

It is not a de Polignac number, because 28399327441 - 2³ = 28399327433 is a prime.

It is a super-2 number, since 2×28399327441² (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 (28399327841) 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 26 ways as a sum of consecutive naturals, for example, 65891496 + ... + 65891926.

Almost surely, 2^28399327441 is an apocalyptic number.

28399327441 is the 168521-st square number.

28399327441 is the 84261-st centered octagonal number.

It is an amenable number.

28399327441 is a deficient number, since it is larger than the sum of its proper divisors (3210844362).

28399327441 is an frugal number, since it uses more digits than its factorization.

28399327441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 471 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The spelling of 28399327441 in words is "twenty-eight billion, three hundred ninety-nine million, three hundred twenty-seven thousand, four hundred forty-one".