72536440 has 32 divisors (see below), whose sum is σ = 165512160. Its totient is φ = 28604800.

The previous prime is 72536423. The next prime is 72536447. The reversal of 72536440 is 4463527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72536447) 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, 9931 + ... + 15610.

It is an arithmetic number, because the mean of its divisors is an integer number (5172255).

Almost surely, 2^72536440 is an apocalyptic number.

It is an amenable number.

72536440 is an abundant number, since it is smaller than the sum of its proper divisors (92975720).

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

72536440 is a wasteful number, since it uses less digits than its factorization.

72536440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25623 (or 25619 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 72536440 is about 8516.8327446299. The cubic root of 72536440 is about 417.0473945828.

Adding to 72536440 its reverse (4463527), we get a palindrome (76999967).

The spelling of 72536440 in words is "seventy-two million, five hundred thirty-six thousand, four hundred forty".