72440560 has 20 divisors (see below), whose sum is σ = 168424488. Its totient is φ = 28976192.

The previous prime is 72440549. The next prime is 72440567. The reversal of 72440560 is 6504427.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×72440560² = 10495269466227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72440567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452674 + ... + 452833.

Almost surely, 2^72440560 is an apocalyptic number.

It is an amenable number.

72440560 is an abundant number, since it is smaller than the sum of its proper divisors (95983928).

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

72440560 is a wasteful number, since it uses less digits than its factorization.

72440560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905520 (or 905514 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 72440560 is about 8511.2020302658. The cubic root of 72440560 is about 416.8635599224.

Adding to 72440560 its reverse (6504427), we get a palindrome (78944987).

The spelling of 72440560 in words is "seventy-two million, four hundred forty thousand, five hundred sixty".