73440340 has 48 divisors (see below), whose sum is σ = 166020624. Its totient is φ = 27187200.

The previous prime is 73440337. The next prime is 73440359. The reversal of 73440340 is 4304437.

It can be written as a sum of positive squares in 8 ways, for example, as 5080516 + 68359824 = 2254^2 + 8268^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18970 + ... + 22510.

It is an arithmetic number, because the mean of its divisors is an integer number (3458763).

Almost surely, 2^73440340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73440340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83010312).

73440340 is an abundant number, since it is smaller than the sum of its proper divisors (92580284).

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

73440340 is a wasteful number, since it uses less digits than its factorization.

73440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628 (or 3626 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 73440340 is about 8569.7339515297. The cubic root of 73440340 is about 418.7725690665.

Adding to 73440340 its reverse (4304437), we get a palindrome (77744777).

The spelling of 73440340 in words is "seventy-three million, four hundred forty thousand, three hundred forty".