73443540 has 24 divisors (see below), whose sum is σ = 205642080. Its totient is φ = 19584928.

The previous prime is 73443529. The next prime is 73443541. The reversal of 73443540 is 4534437.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 73443498 and 73443507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73443541) 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, 611970 + ... + 612089.

It is an arithmetic number, because the mean of its divisors is an integer number (8568420).

Almost surely, 2^73443540 is an apocalyptic number.

It is an amenable number.

73443540 is an abundant number, since it is smaller than the sum of its proper divisors (132198540).

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

73443540 is a wasteful number, since it uses less digits than its factorization.

73443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224071 (or 1224069 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 30.

The square root of 73443540 is about 8569.9206530749. The cubic root of 73443540 is about 418.7786513403.

Adding to 73443540 its reverse (4534437), we get a palindrome (77977977).

The spelling of 73443540 in words is "seventy-three million, four hundred forty-three thousand, five hundred forty".