5440390081 has 27 divisors (see below), whose sum is σ = 6512076777. Its totient is φ = 4531752960.

The previous prime is 5440390073. The next prime is 5440390091. The reversal of 5440390081 is 1800930445.

The square root of 5440390081 is 73759.

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

It can be written as a sum of positive squares in 4 ways, for example, as 50481025 + 5389909056 = 7105^2 + 73416^2 .

It is not a de Polignac number, because 5440390081 - 2³ = 5440390073 is a prime.

It is a super-2 number, since 2×5440390081² = 59195688466886373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5440390091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21168705 + ... + 21168961.

Almost surely, 2^5440390081 is an apocalyptic number.

5440390081 is the 73759-th square number.

5440390081 is the 36880-th centered octagonal number.

It is an amenable number.

5440390081 is a deficient number, since it is larger than the sum of its proper divisors (1071686696).

5440390081 is an frugal number, since it uses more digits than its factorization.

5440390081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The cubic root of 5440390081 is about 1758.7739051065.

The spelling of 5440390081 in words is "five billion, four hundred forty million, three hundred ninety thousand, eighty-one".