73440081 has 64 divisors (see below), whose sum is σ = 133539840. Its totient is φ = 39251520.

The previous prime is 73440077. The next prime is 73440089. The reversal of 73440081 is 18004437.

It is not a de Polignac number, because 73440081 - 2² = 73440077 is a prime.

It is a super-2 number, since 2×73440081² = 10786890994573122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73440089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88390 + ... + 89216.

It is an arithmetic number, because the mean of its divisors is an integer number (2086560).

Almost surely, 2^73440081 is an apocalyptic number.

It is an amenable number.

73440081 is a deficient number, since it is larger than the sum of its proper divisors (60099759).

73440081 is a wasteful number, since it uses less digits than its factorization.

73440081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 73440081 is about 8569.7188401954. The cubic root of 73440081 is about 418.7720767747.

The spelling of 73440081 in words is "seventy-three million, four hundred forty thousand, eighty-one".