73281340 has 24 divisors (see below), whose sum is σ = 167881392. Its totient is φ = 26647680.

The previous prime is 73281337. The next prime is 73281343. The reversal of 73281340 is 4318237.

It is an interprime number because it is at equal distance from previous prime (73281337) and next prime (73281343).

It is a junction number, because it is equal to n+sod(n) for n = 73281299 and 73281308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73281343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166329 + ... + 166768.

It is an arithmetic number, because the mean of its divisors is an integer number (6995058).

Almost surely, 2^73281340 is an apocalyptic number.

It is an amenable number.

73281340 is an abundant number, since it is smaller than the sum of its proper divisors (94600052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73281340 is a wasteful number, since it uses less digits than its factorization.

73281340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333117 (or 333115 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 73281340 is about 8560.4520908653. The cubic root of 73281340 is about 418.4701333347.

Adding to 73281340 its reverse (4318237), we get a palindrome (77599577).

It can be divided in two parts, 7328 and 1340, that added together give a palindrome (8668).

The spelling of 73281340 in words is "seventy-three million, two hundred eighty-one thousand, three hundred forty".