72340043520 has 72 divisors (see below), whose sum is σ = 231036026256. Its totient is φ = 19290677248.

The previous prime is 72340043497. The next prime is 72340043527. The reversal of 72340043520 is 2534004327.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72340043527) 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, 9415437 + ... + 9423116.

It is an arithmetic number, because the mean of its divisors is an integer number (3208833698).

Almost surely, 2^72340043520 is an apocalyptic number.

It is an amenable number.

72340043520 is an abundant number, since it is smaller than the sum of its proper divisors (158695982736).

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

72340043520 is a wasteful number, since it uses less digits than its factorization.

72340043520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18838577 (or 18838563 counting only the distinct ones).

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

Adding to 72340043520 its reverse (2534004327), we get a palindrome (74874047847).

The spelling of 72340043520 in words is "seventy-two billion, three hundred forty million, forty-three thousand, five hundred twenty".